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=={{icon|FA}} Featured articles==
*{{icon|FA}} [[:Apororhynchus]]
*{{icon|FA}} [[:Australiformis]]
*{{icon|FA}} [[:Bird]]
*{{icon|FA}} [[:Cooperative pulling paradigm]]
*{{icon|FA}} [[:Edward Drinker Cope]]
*{{icon|FA}} [[:Gigantorhynchus]]
*{{icon|FA}} [[:Heptamegacanthus]]
*{{icon|FA}} [[:Icelandic Phallological Museum]]
*{{icon|FA}} [[:Leech]]
*{{icon|FA}} [[:Starfish]]
*{{icon|FA}} [[:Viatkogorgon]]
Total pages in content type is 11
=={{icon|DFA}} Former featured articles==
*{{icon|DFA}} [[:Introduction to evolution]]
*{{icon|DFA}} [[:Fauna of Australia]]
*{{icon|DFA}} [[:Fauna of Puerto Rico]]
*{{icon|DFA}} [[:Human]]
*{{icon|DFA}} [[:Myxobolus cerebralis]]
*{{icon|DFA}} [[:Skunks as pets]]
Total pages in content type is 6
=={{icon|FL}} Featured lists==
*{{icon|FL}} [[:List of camouflage methods]]
Total pages in content type is 1
=={{icon|GA}} Good articles==
*{{icon|GA}} [[:Adaptive Coloration in Animals]]
*{{icon|GA}} [[:Ambush predator]]
*{{icon|GA}} [[:Animal]]
*{{icon|GA}} [[:Animal Coloration (book)]]
*{{icon|GA}} [[:Animal coloration]]
*{{icon|GA}} [[:Animal epithet]]
*{{icon|GA}} [[:Animal navigation]]
*{{icon|GA}} [[:Annelid]]
*{{icon|GA}} [[:Anthozoa]]
*{{icon|GA}} [[:Anti-predator adaptation]]
*{{icon|GA}} [[:Aonchotheca forresteri]]
*{{icon|GA}} [[:Aposematism]]
*{{icon|GA}} [[:Arthropod]]
*{{icon|GA}} [[:Bathyphysa conifera]]
*{{icon|GA}} [[:Bioluminescence]]
*{{icon|GA}} [[:Black coral]]
*{{icon|GA}} [[:Bonacynodon]]
*{{icon|GA}} [[:Brachiopod]]
*{{icon|GA}} [[:Bryozoa]]
*{{icon|GA}} [[:Bugula neritina]]
*{{icon|GA}} [[:Caenorhabditis elegans]]
*{{icon|GA}} [[:Cestoda]]
*{{icon|GA}} [[:Chitinozoan]]
*{{icon|GA}} [[:Cleaning symbiosis]]
*{{icon|GA}} [[:Cloudinidae]]
*{{icon|GA}} [[:Cnidaria]]
*{{icon|GA}} [[:Coincident disruptive coloration]]
*{{icon|GA}} [[:The Colours of Animals]]
*{{icon|GA}} [[:Concealing-Coloration in the Animal Kingdom]]
*{{icon|GA}} [[:Coral]]
*{{icon|GA}} [[:Corallivore]]
*{{icon|GA}} [[:Hugh B. Cott]]
*{{icon|GA}} [[:Counter-illumination]]
*{{icon|GA}} [[:Crinoid]]
*{{icon|GA}} [[:Ctenophora]]
*{{icon|GA}} [[:Dazzled and Deceived]]
*{{icon|GA}} [[:Deimatic behaviour]]
*{{icon|GA}} [[:Destruction of ivory]]
*{{icon|GA}} [[:Disruptive eye mask]]
*{{icon|GA}} [[:Dominance hierarchy]]
*{{icon|GA}} [[:Echinoderm]]
*{{icon|GA}} [[:Echiura]]
*{{icon|GA}} [[:Entoprocta]]
*{{icon|GA}} [[:Euchambersia]]
*{{icon|GA}} [[:Eukaryote]]
*{{icon|GA}} [[:Eusociality]]
*{{icon|GA}} [[:Flatworm]]
*{{icon|GA}} [[:Gastrotrich]]
*{{icon|GA}} [[:Eleanor Glanville]]
*{{icon|GA}} [[:Gordodon]]
*{{icon|GA}} [[:Gorgonopsia]]
*{{icon|GA}} [[:Histoire Naturelle]]
*{{icon|GA}} [[:History of Animals]]
*{{icon|GA}} [[:Holozoa]]
*{{icon|GA}} [[:Human]]
*{{icon|GA}} [[:Human uses of animals]]
*{{icon|GA}} [[:Inequity aversion in animals]]
*{{icon|GA}} [[:Jellyfish]]
*{{icon|GA}} [[:Kimberella]]
*{{icon|GA}} [[:Life]]
*{{icon|GA}} [[:Carl Linnaeus]]
*{{icon|GA}} [[:Mammal]]
*{{icon|GA}} [[:Megawhaitsia]]
*{{icon|GA}} [[:Millepora alcicornis]]
*{{icon|GA}} [[:Mollusca]]
*{{icon|GA}} [[:Nemertea]]
*{{icon|GA}} [[:On Growth and Form]]
*{{icon|GA}} [[:Ooedigera]]
*{{icon|GA}} [[:Owha]]
*{{icon|GA}} [[:Pachysentis]]
*{{icon|GA}} [[:Parasites in fiction]]
*{{icon|GA}} [[:Phoronid]]
*{{icon|GA}} [[:Savika]]
*{{icon|GA}} [[:Schinderhannes bartelsi]]
*{{icon|GA}} [[:Scleractinia]]
*{{icon|GA}} [[:Sea anemone]]
*{{icon|GA}} [[:Sea urchin]]
*{{icon|GA}} [[:Sipuncula]]
*{{icon|GA}} [[:Skeleton panda sea squirt]]
*{{icon|GA}} [[:Sponge]]
*{{icon|GA}} [[:Structural coloration]]
*{{icon|GA}} [[:Transitional fossil]]
*{{icon|GA}} [[:Tunicate]]
*{{icon|GA}} [[:Twelves]]
*{{icon|GA}} [[:Venom]]
*{{icon|GA}} [[:Xenoturbella bocki]]
Total pages in content type is 86
=={{icon|DYK}} ''Did you know?'' articles==
*{{icon|DYK}} ... that the '''[[Abarenicola pacifica|Pacific lugworm]]''' must turn its [[esophagus]] inside-out when feeding? <small>(2011-08-01)</small>
*{{icon|DYK}} ... that the sea urchin '''''[[Abatus cordatus]]''''' broods its young for nine months in pockets on its upper surface? <small>(2020-07-23)</small>
*{{icon|DYK}} ... that most '''[[Piscicolidae|fish leeches]]''' cling onto their hosts with suckers but '''''[[Acanthobdella peledina]]''''' uses hooked bristles for this purpose? <small>(2018-05-21)</small>
*{{icon|DYK}} ... that [[chiton]]s, such as '''''[[Acanthochitona crinita]]''''', are molluscs with a shell composed of eight separate articulating [[Valve (mollusc)|valves]]? <small>(2020-01-24)</small>
*{{icon|DYK}} ... that the '''[[Acrocnida brachiata|sand burrowing brittlestar]]''' is often found in association with the [[Echinocardium cordatum|sea potato]]? <small>(2018-07-24)</small>
*{{icon|DYK}} ... that [[Acroporidae|acroporid]] [[coral]] species '''''[[Acropora abrolhosensis]]''''', '''''[[Acropora anthocercis|A. anthocercis]]''''', '''''[[Acropora awi|A. awi]]''''', '''''[[Acropora batunai|A. batunai]]''''', '''''[[Acropora caroliniana|A. caroliniana]]''''', '''''[[Acropora dendrum|A. dendrum]]''''', '''''[[Acropora derawanensis|A. derawanensis]]''''', '''''[[Acropora desalwii|A. desalwii]]''''', '''''[[Acropora donei|A. donei]]''''', '''''[[Acropora echinata|A. echinata]]''''', '''''[[Acropora elegans|A. elegans]]''''', '''''[[Acropora hemprichii|A. hemprichii]]''''', '''''[[Acropora hoeksemai|A. hoeksemai]]''''', '''''[[Acropora horrida|A. horrida]]''''', '''''[[Acropora indonesia|A. indonesia]]''''', '''''[[Acropora kimbeensis|A. kimbeensis]]''''', '''''[[Acropora kirstyae|A. kirstyae]]''''', '''''[[Acropora kosurini|A. kosurini]]''''', '''''[[Acropora loisetteae|A. loisetteae]]''''', '''''[[Acropora lokani|A. lokani]]''''', '''''[[Acropora microclados|A. microclados]]''''', '''''[[Acropora multiacuta|A. multiacuta]]''''', '''''[[Acropora paniculata|A. paniculata]]''''', '''''[[Acropora papillare|A. papillare]]''''', '''''[[Acropora pharaonis|A. pharaonis]]''''', '''''[[Acropora plumosa|A. plumosa]]''''', and '''''[[Acropora polystoma|A. polystoma]]''''' are all classed as [[Vulnerable species|vulnerable]]? <small>(2015-08-13)</small>
*{{icon|DYK}} ... that the coral '''''[[Acropora aculeus]]''''' is particularly susceptible to [[coral bleaching]] and coral diseases and is listed as a [[vulnerable species]]? <small>(2017-11-22)</small>
*{{icon|DYK}} ... that [[Acropora|stagshorn corals]] such as '''''[[Acropora pulchra]]''''' and '''''[[Acropora aspera]]''''' are fed on preferentially by the [[crown-of-thorns starfish]]? <small>(2013-02-15)</small>
*{{icon|DYK}} ... that it is unclear if individual specimens of coral '''''[[Acropora cytherea]]''''' were being damaged by infestations of '''[[Cymo melanodactylus|furry coral crab]]''' in the [[Chagos Archipelago]] in 2010? <small>(2013-01-27)</small>
*{{icon|DYK}} ... that fragments of the coral '''''[[Acropora grandis]]''''' ''(pictured with [[Paracirrhites forsteri|hawkfish]])'' have been successfully transplanted to a nursery bed and used to regenerate a damaged [[coral reef]]? <small>(2013-04-02)</small>
*{{icon|DYK}} ... that on the [[Great Barrier Reef]], the [[Scleractinia|coral]] '''''[[Acropora loripes]]''''' breeds synchronously five or six days after the [[full moon]] in November and December? <small>(2013-05-31)</small>
*{{icon|DYK}} ... that the Indian Ocean coral '''''[[Acropora rudis]]''''' is "[[Endangered species|endangered]]" by habitat destruction and its susceptibility to coral bleaching, disease and ocean acidification? <small>(2017-07-21)</small>
*{{icon|DYK}} ... that in the [[Southern Hemisphere]], the [[coral]] '''''[[Acropora secale]]''''' normally [[Spawn (biology)|spawns]] in November, six days after the [[full moon]]? <small>(2013-01-12)</small>
*{{icon|DYK}} ... that populations of '''''[[Actinoporus elegans]]''''' were thought to be restricted to the western Atlantic until they were collected at the east Atlantic islands of [[São Tomé and Príncipe]] in 2004? <small>(2010-06-20)</small>
*{{icon|DYK}} ... that the sea cucumber '''''[[Actinopyga agassizii]]''''' has five teeth surrounding its anus? <small>(2020-03-18)</small>
*{{icon|DYK}} ... that the '''[[Actinopyga capillata|hairy sea cucumber]]''' has long [[tube feet]] on its dorsal surface, giving it a furry appearance? <small>(2020-02-13)</small>
*{{icon|DYK}} ... that the '''[[Actinopyga echinites|brownfish]]''' is harvested commercially over most of its range despite being described by the [[International Union for Conservation of Nature|IUCN]] as a [[vulnerable species]]? <small>(2018-12-05)</small>
*{{icon|DYK}} ... that in times of food scarcity, the '''[[Actinostella flosculifera|collared sand anemone]]''' may consume the symbiotic [[zooxanthellae]] in its tissues? <small>(2021-06-30)</small>
*{{icon|DYK}} ... that in Norwegian [[fjord]]s, the sea anemone '''''[[Actinostola callosa]]''''' feeds heavily on the [[helmet jellyfish]]? <small>(2017-07-19)</small>
*{{icon|DYK}} ... that the '''[[Actinothoe sphyrodeta|sandalled anemone]]''' reproduces by [[Fission (biology)#Types of binary fission|longitudinal fission]]? <small>(2018-10-06)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Adamsia palliata]]''''' growing on the exterior of a [[gastropod shell]] inhabited by the [[hermit crab]] '''''[[Pagurus prideaux]]''''' is capable of enlarging the shell to better accommodate the crab inside? <small>(2011-09-12)</small>
*{{icon|DYK}} ... that '''''[[Adaptive Coloration in Animals]]''''' was said to be the only zoology book ever to be packed in a soldier's kitbag? <small>(2012-11-23)</small>
*{{icon|DYK}} ... that the [[rotifer]] '''''[[Adineta ricciae]]''''' gave up [[sex]] about 80 million years ago? <small>(2012-12-11)</small>
*{{icon|DYK}} ... that both animals and plants '''[[Advertising in biology|self-advertise]]'''? <small>(2016-04-10)</small>
*{{icon|DYK}} ... that the '''[[African Wildlife Foundation]]''' is helping feed the only remaining [[West African Giraffe]]s ''(pictured)'' in [[Niger]]? <small>(2011-11-21)</small>
*{{icon|DYK}} ... that '''[[Agaricia agaricites|lettuce coral]]''' and '''[[Agaricia tenuifolia|thin leaf lettuce coral]]''' can both be considered "weed" corals? <small>(2015-07-06)</small>
*{{icon|DYK}} ... that [[siltstone]] deposits have allowed three-dimensional [[fossil]]s of the extinct '''[[Agaricocrinus americanus|mushroom crinoid]]''' to be excavated from [[Indiana]]? <small>(2013-02-06)</small>
*{{icon|DYK}} ... that many '''[[Agelas clathrodes|orange elephant ear sponges]]''' are busy on an afternoon in late July shortly before the [[new moon]]? <small>(2012-11-25)</small>
*{{icon|DYK}} ... that the '''[[Agelas flabelliformis|elephant ear sponge]]''' is said to resemble a piece of [[Tanning|tanned]] [[Hide (skin)|cow hide]]? <small>(2012-12-01)</small>
*{{icon|DYK}} ... that the '''[[Agelas schmidti|brown tubular sponge]]''' often has a [[Colony (biology)|colonial]] [[coral]] living [[Symbiosis|symbiotically]] on its surface? <small>(2012-08-12)</small>
*{{icon|DYK}} ... that '''''[[Aglantha digitale]]''''' ''(pictured)'' has a slow swimming action but a rapid escape response? <small>(2018-10-02)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Aiptasia diaphana]]''''' can produce new individuals when fragments of its base become detached? <small>(2014-12-31)</small>
*{{icon|DYK}} ... that sea fans such as '''''[[Leptogorgia sarmentosa]]''''' and '''''[[Eunicella singularis]]''''' are sometimes overgrown by '''[[Alcyonium coralloides|false coral]]'''? <small>(2015-01-05)</small>
*{{icon|DYK}} ... that the [[Alcyonacea |soft coral]] '''[[Alcyonium digitatum|dead man's fingers]]''' ''(pictured)'' can live for 20 years? <small>(2011-06-02)</small>
*{{icon|DYK}} ... that despite living in complete darkness at [[Bathyal zone|bathyal depths]], the sea anemone '''''[[Allantactis|Allantactis parasitica]]''''' synchronises its breeding activity with the phases of the moon? <small>(2017-08-01)</small>
*{{icon|DYK}} ... that the [[nudibranch]] '''''[[Okenia zoobotryon]]''''' may contain the same anti-predator [[secondary metabolite|chemicals]] as its prey, the [[bryozoa]]n '''''[[Zoobotryon verticillatum]]'''''? <small>(2014-02-07)</small>
*{{icon|DYK}} ... that the '''[[Perophora viridis|honeysuckle tunicate]]''' often grows intertwined with the [[bryozoa]]n '''''[[Amathia vidovici]]'''''? <small>(2013-04-10)</small>
*{{icon|DYK}} ... that the [[megafauna]] on the seabed of the '''[[Porcupine Abyssal Plain]]''' is dominated by [[sea cucumber]]s such as '''''[[Oneirophanta mutabilis]]''''', '''''[[Psychropotes longicauda]]''''', and '''''[[Amperima rosea]]'''''? <small>(2014-01-14)</small>
*{{icon|DYK}} ... that in the north of its range, the '''[[Amphianthus dohrnii|sea fan anemone]]''' lives on the '''[[Swiftia pallida|northern sea fan]]''' and further south, on the '''[[broad sea fan]]'''? <small>(2015-01-01)</small>
*{{icon|DYK}} ... that the '''[[Ophiothrix suensoni|sponge brittle star]]''' is often found living on the surface of the '''[[Haliclona compressa|red tree sponge]]'''? <small>(2012-10-05)</small>
*{{icon|DYK}} ... that the '''[[Amphiodia urtica|burrowing brittle star]]''' submerges itself in mud and raises its arms to feed? <small>(2019-03-23)</small>
*{{icon|DYK}} ... that a build up in numbers of the [[brittle star]] '''''[[Amphiura filiformis]]''''' in the [[North Sea]] may have been caused by [[eutrophication]]? <small>(2013-03-28)</small>
*{{icon|DYK}} ... that the '''[[Amynthas mekongianus|Mekong giant earthworm]]''' can grow to a length of {{convert|2.9|m|ft|0|abbr=off}}? <small>(2017-11-24)</small>
*{{icon|DYK}} ... that the '''[[Anasterias antarctica|Cinderella starfish]]''' normally fasts while brooding its young? <small>(2019-03-10)</small>
*{{icon|DYK}} ... that the starfish '''''[[Anasterias rupicola]]''''' feeds on the limpet '''''[[Nacella macquariensis]]''''', sometimes hunting it in groups? <small>(2012-07-09)</small>
*{{icon|DYK}} ... that '''''[[Andiva]]''''' ''(fossil pictured)'', an enigmatic animal that lived 555 millions of years ago, perhaps had a convex [[carapace]]? <small>(2013-02-02)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Anemonia sulcata]]''''' is known as {{lang|es|ortiguilla}} in southern Spain, where it is a popular seafood? <small>(2019-08-18)</small>
*{{icon|DYK}} ... that [[nematode]] '''''[[Angiostrongylus vasorum]]''''' lives in the [[heart]]s of [[dog]]s? <small>(2009-11-28)</small>
*{{icon|DYK}} ... that a family in [[Whitehorse, Canada]], was so afraid of '''[[animal aggression]]''' that the parents went fully armed to walk their children to school? <small>(2012-10-11)</small>
*{{icon|DYK}} ... that a 240-million-year-old '''[[animal latrine]]''' was dubbed "the oldest communal toilet"? <small>(2014-01-06)</small>
*{{icon|DYK}} ... that in 1873, J. J. Murphy proposed an [[Inertial navigation|inertial]] model of '''[[animal navigation]]''' in ''[[Nature (journal)|Nature]]'', challenging [[Charles Darwin|Darwin]]'s views? <small>(2012-03-10)</small>
*{{icon|DYK}} ... that [[Plutarch]] believed that '''[[Animals in ancient Greece and Rome|animals were more virtuous]]''' than humans? <small>(2022-10-19)</small>
*{{icon|DYK}} ... that in addition to [[human spaceflight]], there have been many '''[[animals in space]]''', including [[monkey]]s, [[ape]]s, [[mice]], [[dogs]], [[guinea pig]]s, [[frog]]s, [[rat]]s, [[cat]]s, [[tortoise]]s, [[fish]], [[newt]]s, [[insect]]s, [[snail]]s, [[spider]]s and [[nematode]]s? <small>(2004-04-17)</small>
*{{icon|DYK}} ... that the '''[[Antedon mediterranea|Mediterranean feather star]]''' is often found clinging to [[gorgonian|sea whips]]? <small>(2013-02-16)</small>
*{{icon|DYK}} ... that the [[Planula|larvae]] of the soft coral '''''[[Anthelia glauca]]''''' are [[Egg incubation|brooded]] in a unique pharyngeal pouch? <small>(2015-07-15)</small>
*{{icon|DYK}} ... that the '''[[Anthopleura thallia|glaucus pimplet]]''' can be distinguished from the closely related '''[[Anthopleura ballii|red speckled anemone]]''' by the sediment that sticks to its column? <small>(2015-02-20)</small>
*{{icon|DYK}} ... that the [[diterpene]] [[Bipinnatin J]] can be isolated from the '''[[Antillogorgia bipinnata|bipinnate sea plume]]'''? <small>(2015-01-15)</small>
*{{icon|DYK}} ... that the [[basket star]] '''''[[Astrobrachion constrictum]]''''' is always found living in association with a black coral such as '''''[[Antipathes fiordensis]]'''''? <small>(2018-04-02)</small>
*{{icon|DYK}} ... that although related species usually infect several [[host (biology)|hosts]], the [[parasitic]] [[nematode]] worm '''''[[Aonchotheca forresteri]]''''' is known only from the [[marsh rice rat]]? <small>(2010-05-06)</small>
*{{icon|DYK}} ... that the yellow sponge '''''[[Aplysina aerophoba]]''''' turns blue when exposed to air? <small>(2020-10-07)</small>
*{{icon|DYK}} ... that the sponge '''''[[Aplysina cavernicola]]''''' ''(pictured)'' has been used as a [[model organism]] to monitor the presence of isotopes such as [[americium-241]] in seawater? <small>(2020-04-15)</small>
*{{icon|DYK}} ... that the '''[[Aplysina insularis|yellow tube sponge]]''' appears bright greenish yellow in deep water because it emits fluorescent light? <small>(2012-10-18)</small>
*{{icon|DYK}} ... that the [[crinoid]] '''''[[Aporometra wilsoni]]''''' broods its young in cavities in the feathery pinnules on its arms? <small>(2019-04-29)</small>
*{{icon|DYK}} ... that the '''[[Apostichopus japonicus|Japanese sea cucumber]]''' can [[Aestivation|aestivate]] and remain in a [[Dormancy|dormant]] state for up to four years? <small>(2012-06-15)</small>
*{{icon|DYK}} ... that seven of the seventeen '''[[Apostles of Linnaeus|apostles]]''' that Swedish botanist [[Carl Linnaeus]] sent out died on their journeys? <small>(2010-06-05)</small>
*{{icon|DYK}} ... that a male and female pair of sand [[Starfish|stars]], '''''[[Archaster typicus]]''''', engage in [[pseudocopulation]] so that when they [[Spawn (biology)|spawn]], some two months later, they will do so simultaneously? <small>(2012-04-18)</small>
*{{icon|DYK}} ... that the scale worm '''''[[Arctonoe vittata]]''''' protects the '''[[Diodora aspera|keyhole limpet]]''' ''(shell pictured)'' with which it lives by attacking predatory starfish? <small>(2017-09-22)</small>
*{{icon|DYK}} ... that the '''[[Clathrina canariensis|yellow calcareous sponge]]''' may be overgrown by other organisms? <small>(2012-11-23)</small>
*{{icon|DYK}} ... that the [[tunicate]] '''''[[Ascidia mentula]]''''' may have a [[pea crab]], [[Bivalvia|bivalve mollusc]] or [[copepod]] living in its body cavity? <small>(2013-06-05)</small>
*{{icon|DYK}} ... that [[definitive host]]s for the [[trematode|fluke]] '''''[[Ascocotyle pindoramensis]]''''' include a variety of [[bird]]s as well as the [[marsh rice rat]]? <small>(2010-05-10)</small>
*{{icon|DYK}} ... that the deep water [[sea urchin]] '''''[[Aspidodiadema jacobi]]''''' may brood its [[Egg (biology)|eggs]] among its spines? <small>(2012-03-11)</small>
*{{icon|DYK}} ... that the peanut worm '''''[[Aspidosiphon elegans]]''''' reproduces by [[Fission (biology)|transverse fission]]? <small>(2019-03-03)</small>
*{{icon|DYK}} ... that the solitary coral '''''[[Heterocyathus aequicostatus]]''''' often lives in [[symbiosis]] with a '''[[Aspidosiphon muelleri|small worm]]''' that moves it around? <small>(2019-03-12)</small>
*{{icon|DYK}} ... that the male '''[[Asterias forbesi|Forbes sea star]]''' ''(underside pictured)'' is sometimes castrated by '''''[[Orchitophrya stellarum]]''''', a [[Parasitism|parasite]] which feeds on its [[gonad]]s? <small>(2012-05-24)</small>
*{{icon|DYK}} ... that the starfish '''''[[Asterina gibbosa]]''''' cements its [[Egg (biology)|egg cluster]] to a rock while '''''[[Asterina phylactica]]''''' [[Egg incubation|broods]] its young? <small>(2013-11-09)</small>
*{{icon|DYK}} ... that the '''[[Asterina pancerii|seagrass asterina]]''' is a [[Sequential hermaphroditism|sequential hermaphrodite]], starting life as a female and later becoming a male? <small>(2021-07-14)</small>
*{{icon|DYK}} ... that despite its bright colouring, the '''[[Asterodiscides truncatus|firebrick starfish]]''' is inconspicuous among the sponges and other organisms in its habitat? <small>(2018-04-17)</small>
*{{icon|DYK}} ... that the '''[[Asthenosoma varium|fire urchin]]''' plays host to two species of shrimp as well as the zebra crab, ''[[Zebrida adamsii]]''{{-?}} <small>(2021-07-26)</small>
*{{icon|DYK}} ... that the '''[[Astichopus|furry sea cucumber]]''' can speed along at nearly two metres a minute (6 ft/min)? <small>(2014-03-20)</small>
*{{icon|DYK}} ... that the '''[[Astrangia poculata|northern cup coral]]''' often contains [[Symbiosis|symbiotic]] [[Symbiodinium |zooxanthellae]] in its tissues, whereas the '''[[Astrangia solitaria|southern cup coral]]''' does not? <small>(2015-03-03)</small>
*{{icon|DYK}} ... that '''''[[Cliona orientalis]]''''' is a [[Bioerosion|bioeroding]] sponge that tunnels into such corals as '''''[[Goniopora tenuidens]]''''', '''''[[Dipsastraea pallida]]''''', and '''''[[Astreopora listeri]]'''''? <small>(2018-11-14)</small>
*{{icon|DYK}} ... that despite being structurally weakened, it may be beneficial to the '''[[Astreopora myriophthalma|porous star coral]]''' when the bivalve '''''[[Lithophaga simplex]]''''' bores into it? <small>(2018-10-24)</small>
*{{icon|DYK}} ... that in 1989, the colonial coral '''''[[Astroides|Astroides calycularis]]''''' expanded its range to the [[Adriatic Sea]] after previously being restricted to an area west of [[Sicily]]? <small>(2015-01-11)</small>
*{{icon|DYK}} ... that the '''[[Astropecten polyacanthus|comb star]]''' (''Astropecten polyacanthus'') contains a potent [[neurotoxin]] called [[tetrodotoxin]]? <small>(2012-04-12)</small>
*{{icon|DYK}} ... that the '''[[Astrophyton|giant basket star]]''' ''(pictured)'' climbs to an elevated position and spreads its arms to "fish"? <small>(2015-09-25)</small>
*{{icon|DYK}} ... that the '''[[Dorippe frascone|urchin crab]]''' is named for its habit of carrying a [[sea urchin]] such as the '''[[Astropyga radiata|false fire urchin]]''' ''(pictured)'' on its back? <small>(2013-02-03)</small>
*{{icon|DYK}} ... that the [[tunicate]]s '''''[[Didemnum molle]]''''' ''(pictured)'' and '''''[[Atriolum robustum]]''''' both brood their developing [[embryo]]s? <small>(2014-02-20)</small>
*{{icon|DYK}} ... that the adult tapeworm '''''[[Australamphilina elongata]]''''' is found in freshwater turtles, but how its eggs emerge from the host's body cavity is unknown? <small>(2018-06-13)</small>
*{{icon|DYK}} ... that '''''[[Australiformis|Australiformis semoni]]''''' is a parasite that infests [[marsupial]]s in Australia and [[New Guinea]] and whose infestation could cause debilitating [[Peptic ulcer disease|ulcerative]] granulomatous [[gastritis]]? <small>(2023-06-06)</small>
*{{icon|DYK}} ... that the acorn worm '''''[[Balanoglossus gigas]]''''' gives a strong [[iodoform]]-like smell when handled, possibly to ward off predators? <small>(2023-05-09)</small>
*{{icon|DYK}} ... that the '''[[Balanophyllia elegans|orange cup coral]]''' ''(pictured)'' obtains part of its nutritional needs from carbon compounds dissolved in sea water? <small>(2017-11-09)</small>
*{{icon|DYK}} ... that '''[[bamboo coral]]''' specimens ''(pictured)'' have been found that are 4,000 years old? <small>(2009-05-19)</small>
*{{icon|DYK}} ... that the Asian freshwater leech '''''[[Barbronia weberi]]''''' has invaded [[North Carolina]]? <small>(2020-07-10)</small>
*{{icon|DYK}} ... that '''[[Ancylomenes pedersoni|Pederson's shrimp]]''', the '''[[spotted cleaner shrimp]]''' and the '''[[Heteromysis actiniae|anemone mysid]]''' are all found living in close [[Association (ecology)|association]] with the '''[[Bartholomea annulata|ringed anemone]]'''? <small>(2012-09-21)</small>
*{{icon|DYK}} ... that '''[[Bathycrinus aldrichianus|lilies]]''' grow two to three miles below the surface of the North Atlantic? <small>(2014-12-19)</small>
*{{icon|DYK}} ... that the gonads of jellyfish '''''[[Bathykorus bouilloni]]''''' ''(pictured)'' have not been observed? <small>(2011-11-25)</small>
*{{icon|DYK}} ... that the jellyfish '''''[[Bazinga rieki]]''''' was named in part for the catchphrase uttered by [[Sheldon Cooper]] in ''[[The Big Bang Theory]]''? <small>(2013-08-09)</small>
*{{icon|DYK}} ... that the colonial bryozoan '''''[[Beania magellanica]]''''', widely distributed in the Southern Hemisphere, has recently turned up in the Mediterranean Sea? <small>(2020-12-29)</small>
*{{icon|DYK}} ... that the Ph.D dissertation of taphonomist '''[[Kay Behrensmeyer]]''' suggested that [[sauropod]]s were terrestrial? <small>(2013-10-27)</small>
*{{icon|DYK}} ... that the [[comb jelly]] '''''[[Beroe cucumis]]''''' feeds on other comb jellies, particularly '''''[[Bolinopsis infundibulum]]'''''? <small>(2015-03-23)</small>
*{{icon|DYK}} ... that the comb jelly '''''[[Beroe gracilis]]''''' feeds on other [[Ctenophora|comb jellies]], swallowing them whole? <small>(2021-09-01)</small>
*{{icon|DYK}} ... that the [[Ctenophora|comb jelly]] '''''[[Beroe ovata]]''''' can consume four times its body weight in a day? <small>(2015-03-21)</small>
*{{icon|DYK}} ... that '''''[[Bicellariella ciliata]]''''', '''''[[Crisularia plumosa]]''''', '''''[[Bugulina flabellata]]''''' and '''''[[Bugulina turbinata]]''''' form part of a [[bryozoa]]n "turf" on steep or vertical rock exposed to moderate water movement? <small>(2021-08-28)</small>
*{{icon|DYK}} ... that the sponge '''''[[Biemna variantia]]''''' broods its young, and can also reproduce by budding and fragmentation? <small>(2020-09-06)</small>
*{{icon|DYK}} ... that groups of '''[[Bispira brunnea|social feather dusters]]''' sway in unison in the water current and retract into their tubes at the slightest disturbance? <small>(2020-02-16)</small>
*{{icon|DYK}} ... that the worm '''''[[Bispira volutacornis]]''''' is sometimes parasitised by a [[copepod]], several of which may move around among the feathery plumes? <small>(2021-07-28)</small>
*{{icon|DYK}} ... that when boiled in milk, '''[[black coral]]''' ''(example pictured)'' emits a faint scent of [[myrrh]]? <small>(2020-06-21)</small>
*{{icon|DYK}} ... that a fossil of the [[Middle Permian]] [[therocephalian]] '''''[[Blattoidealestes]]''''' represents the oldest record of [[multicuspid]] teeth among [[theriodont]]s, the ancestors of mammals? <small>(2012-02-25)</small>
*{{icon|DYK}} ... that 15 '''[[Carapus mourlani|star pearlfish]]''' were found living inside a single '''[[Bohadschia argus|leopard sea cucumber]]'''? <small>(2012-01-26)</small>
*{{icon|DYK}} ... that the '''[[Boltenia villosa|hairy sea squirt]]''' is preyed on by the [[Fusitriton oregonensis|Oregon hairy triton]]? <small>(2019-05-04)</small>
*{{icon|DYK}} ... that the colonial tunicate '''''[[Botrylloides leachii]]''''' can regenerate its whole body from a small fragment of tissue? <small>(2021-05-04)</small>
*{{icon|DYK}} ... that '''[[Bourgueticrinida]]''' is an [[Order (biology)|order]] of [[crinoid]]s that nearly became extinct in the [[Permian-Triassic extinction event]]? <small>(2013-02-23)</small>
*{{icon|DYK}} ... that most '''[[Branchiobdellida|branchiobdellids]]''' use [[crayfish]] as hosts, living on their heads, [[carapace]]s, or [[Chela (organ)|claws]], but in some instances inside their gill cavities? <small>(2020-05-04)</small>
*{{icon|DYK}} ... that the [[invertebrate]] '''[[Branchiostoma lanceolatum|amphioxus]]''' ''(pictured)'' serves as a [[model organism]] for studying the development of [[vertebrate]]s? <small>(2011-11-30)</small>
*{{icon|DYK}} ... that taxidermist '''[[Harry Ferris Brazenor|Harry Brazenor]]''' [[Taxidermy|mounted]] the Salford tiger ''(pictured)'' in 1914? <small>(2021-10-26)</small>
*{{icon|DYK}} ... that members of the '''[[Brisingidae]]''' family hold up their arms while members of '''[[Freyellidae]]''' do not? <small>(2018-12-04)</small>
*{{icon|DYK}} ... that the name '''''[[Bucephalus (trematode)|Bucephalus]]''''', meaning "ox head", was given to a genus of [[Trematoda|trematodes]] because their [[Trematode lifecycle stages#Typical lifestyle stages|cercaria]] larva ''(pictured)'' seemed to have horns? <small>(2011-02-25)</small>
*{{icon|DYK}} ... that the [[mutualism (biology)|mutualism]] between [[hermit crab]]s and the [[sea anemone]] '''''[[Calliactis parasitica]]''''' ''(pictured)'' may require the presence of an [[octopus]]? <small>(2011-02-28)</small>
*{{icon|DYK}} ... that the '''[[Calliactis tricolor|hitchhiking anemone]]''' is often attached to shells occupied by the [[hermit crab]]s '''''[[Dardanus venosus]]''''' and '''''[[Clibanarius vittatus]]'''''? <small>(2012-04-25)</small>
*{{icon|DYK}} ... that in the [[Mediterranean Sea]], recruitment of the bryozoan '''''[[Callopora lineata]]''''' takes place in February and March, whereas in the [[Isle of Man]], it takes place all year round? <small>(2021-01-06)</small>
*{{icon|DYK}} ... that the [[sea urchin]] order '''[[Echinothurioida]]''' was known only from [[fossil]]s until deep water exploration discovered living species such as '''''[[Calveriosoma gracile]]'''''? <small>(2012-12-20)</small>
*{{icon|DYK}} ... that the [[nematode]] '''''[[Capillaria aerophila]]''''' is a [[parasite]] that infests the [[respiratory system]] of [[carnivore|carnivorous]] mammals, including [[dog]]s and [[fox]]es? <small>(2008-12-01)</small>
*{{icon|DYK}} ... that the [[nematode]] '''''[[Capillaria plica]]''''' is a [[parasitism|parasite]] found in the [[urinary bladder]] of dogs, cats and various [[mammal]]s? <small>(2008-11-29)</small>
*{{icon|DYK}} ... that in 1980, a '''[[Carcinonemertes errans|ribbon worm]]''' was implicated in the collapse of the [[Dungeness crab]] fishery in central California? <small>(2019-03-24)</small>
*{{icon|DYK}} ... that the nudibranch '''''[[Tritoniopsis elegans]]''''' ''(pictured)'' is one of only three predators known to feed on the invasive '''[[Carijoa riisei|snowflake coral]]'''? <small>(2015-04-13)</small>
*{{icon|DYK}} ... that reproduction in the sea wasp '''''[[Carybdea marsupialis]]''''' involves a sexual reproduction phase, [[budding]] and [[Fragmentation (reproduction)|fragmentation]]? <small>(2015-01-20)</small>
*{{icon|DYK}} ... that the barnacle '''''[[Megatrema anglicum]]''''' lives semi-parasitically on such corals as the '''[[Caryophyllia smithii|Devonshire cup coral]]'''? <small>(2015-01-14)</small>
*{{icon|DYK}} ... that the '''[[Cassiopea xamachana|upside-down jellyfish]]''' has three different methods of obtaining nutrients? <small>(2015-03-19)</small>
*{{icon|DYK}} ... that '''''[[Catalaphyllia|Catalaphyllia jardinei]]''''', known commonly as elegance coral, can reproduce either [[sexual reproduction|sexually]] or [[asexual reproduction|asexually]]? <small>(2013-11-11)</small>
*{{icon|DYK}} ... that although the only known natural [[definitive host]] of the [[trematode|fluke]] '''''[[Catatropis johnstoni]]''''' is the [[marsh rice rat]], its normal host may be a [[bird]]? <small>(2010-05-11)</small>
*{{icon|DYK}} ... that [[fossil]]s of the [[bryozoa]]n '''''[[Cauloramphus disjunctus]]''''' dating back a million years have been found with their spines intact? <small>(2013-01-06)</small>
*{{icon|DYK}} ... that the '''[[Cenocrinus|great West Indian sea lily]]''' can [[Autotomy|break free]] from its stem in order to evade [[Predation|predators]]? <small>(2013-02-18)</small>
*{{icon|DYK}} ... that the '''[[Ceramaster patagonicus|cookie star]]''' feeds on the '''[[cloud sponge]]'''? <small>(2012-10-10)</small>
*{{icon|DYK}} ... that the '''[[Cerebratulus lacteus|milky ribbon worm]]''' feeds on [[soft-shell clam]]s, inserting its proboscis through the siphon and devouring the soft tissues? <small>(2017-10-13)</small>
*{{icon|DYK}} ... that the ribbon worm '''''[[Cerebratulus marginatus]]''''' can swim well by undulating its body? <small>(2017-11-05)</small>
*{{icon|DYK}} ... that the [[sea anemone]] '''''[[Cerianthus lloydii]]''''' lives in a parchment-like tube? <small>(2012-07-10)</small>
*{{icon|DYK}} ... that multiple '''[[Phoronis australis|horseshoe worms]]''' may be associated with a single '''[[Cerianthus membranaceus|cylinder anemone]]''' ''(pictured)''? <small>(2015-06-17)</small>
*{{icon|DYK}} ... that adult '''[[Cestoda|tapeworm]]s''' parasitise the intestines of vertebrates but do not have guts of their own? <small>(2018-08-16)</small>
*{{icon|DYK}} ... that the [[polychaete]] worm '''''[[Chaetopterus variopedatus]]''''' can regenerate its whole body from a single [[Segmentation (biology)|segment]]? <small>(2011-06-29)</small>
*{{icon|DYK}} ... that the venomous '''[[Chiropsalmus quadrumanus|box jellyfish]]''' (''Chiropsalmus quadrumanus'') once killed a child within forty minutes of his being stung? <small>(2012-06-27)</small>
*{{icon|DYK}} ... that eighty years on, scientists are still debating whether the [[Palaeozoic|Palæozoic]] [[fossil]]s known as '''[[Chitinozoa]]ns''' ''([[Scanning electron microscopy|SEM]] image pictured)'' represent plants, animals or eggs? <small>(2007-09-05)</small>
*{{icon|DYK}} ... that the encrusting bryozoan '''''[[Chorizopora brongniartii]]''''' has a strategy for avoiding being overgrown by [[Pomatoceros triqueter|worm tubes]]? <small>(2021-03-31)</small>
*{{icon|DYK}} ... that the giant jellyfish '''''[[Chrysaora achlyos]]''''' is the largest [[invertebrate]] discovered in the [[20th century]]? <small>(2007-10-25)</small>
*{{icon|DYK}} ... that the deepwater sea urchin '''''[[Cidaris blakei]]''''' is named after a ship? <small>(2018-06-24)</small>
*{{icon|DYK}} ... that the '''[[Cidaris cidaris|long-spine slate pen sea urchin]]''' ''(pictured)'' can suffer from [[bald sea urchin disease]]? <small>(2013-04-30)</small>
*{{icon|DYK}} ... that the '''[[Ciona savignyi|Pacific transparent sea squirt]]''' invaded the [[contiguous United States]] via [[Long Beach Harbor]]? <small>(2013-07-04)</small>
*{{icon|DYK}} ... that '''[[Clara the rhinoceros]]''', the fifth living [[rhinoceros]] to be seen in [[Europe]] in modern times, became famous during a seventeen year [[Grand Tour|tour of Europe]] from [[1741]] to [[1758]]? <small>(2006-07-25)</small>
*{{icon|DYK}} ... that the encrusting sponge '''''[[Clathria aceratoobtusa]]''''' kills corals? <small>(2020-10-11)</small>
*{{icon|DYK}} ... that the '''[[Clathria prolifera|red beard sponge]]''' may have travelled to the west coast of North America on the hull of a ship? <small>(2016-03-17)</small>
*{{icon|DYK}} ... that the soft coral '''''[[Clavularia crassa]]''''' broods its eggs on the outside of the [[polyp]]s? <small>(2015-04-13)</small>
*{{icon|DYK}} ... that in 420 BC, Herodotus claimed Nile crocodiles had a '''[[cleaning symbiosis]]''' with a bird ''(pictured)''? <small>(2012-02-17)</small>
*{{icon|DYK}} ... that the '''[[Cliona californiana|yellow boring sponge]]''' inhabits the shells of living scallops and oysters? <small>(2017-12-18)</small>
*{{icon|DYK}} ... that the aggressive [[sponge]] '''''[[Cliona delitrix]]''''' grows on massive [[coral]]s while the encrusting coral, '''''[[Parazoanthus parasiticus]]''''', uses the sponge as a [[Host (biology)|host]]? <small>(2012-07-23)</small>
*{{icon|DYK}} ... that the '''[[Cliona viridis|green boring sponge]]''' hollows out galleries in [[limestone]] rock? <small>(2013-11-27)</small>
*{{icon|DYK}} ... that the '''[[Clypeaster rosaceus|fat sea biscuit]]''' covers its [[test (biology)|test]] during the day with pieces of plant and fragments of shell, holding them in place with its tube feet? <small>(2018-06-08)</small>
*{{icon|DYK}} ... that more than half the organic content of the [[Tunicate#Body_structure|tunic]] of the '''[[Cnemidocarpa finmarkiensis|shiny orange sea squirt]]''' consists of [[cellulose]]? <small>(2019-02-03)</small>
*{{icon|DYK}} ... that '''[[Matthew Cobb]]''', winner of the 2021 [[The Genetics Society#JBS Haldane Lecture|JBS Haldane Lecture]], started his academic career by getting twins drunk? <small>(2020-12-20)</small>
*{{icon|DYK}} ... that a bear ate 75 pounds (34&nbsp;kg) of cocaine in 1985, and was nicknamed '''[[Cocaine Bear (bear)|Pablo Eskobear]]'''? <small>(2022-12-30)</small>
*{{icon|DYK}} ... that despite a nationwide ban, an estimated amount of over ₹900 [[crore]] (US$130 million) was wagered on '''[[cockfighting in India]]''' ''(example pictured)'' in 2019? <small>(2020-09-15)</small>
*{{icon|DYK}} ... that the coral '''''[[Coelastrea aspera]]''''' has a "memory" of at least ten years? <small>(2015-05-10)</small>
*{{icon|DYK}} ... that the '''[[Coeloplana astericola|creeping comb jelly]]''' lives on the surface of a '''[[Echinaster luzonicus|starfish]]''' ''(pictured)'' in the family '''[[Echinasteridae]]'''? <small>(2018-08-03)</small>
*{{icon|DYK}} ... that a listing on [[eBay]] led to the discovery of '''[[Coelopleurus exquisitus|a new species]]'''? <small>(2011-09-23)</small>
*{{icon|DYK}} ... that the [[extinct]] [[coral]] '''''[[Coelosimilia]]''''' is the first known example of a [[scleractinia]]n coral to have a skeleton not composed of the mineral [[aragonite]]? <small>(2009-01-25)</small>
*{{icon|DYK}} ... that the 1890 book '''''[[The Colours of Animals]]''''' introduced the term ''[[aposematism]]'' for the [[skunk]]'s warning colours ''(pictured)''? <small>(2012-12-06)</small>
*{{icon|DYK}} ... that some [[stony coral]]s, such as the aptly named '''[[Colpophyllia natans|boulder brain corals]]''' ''(pictured)'', resemble over-sized [[cerebrum|cerebra]]? <small>(2010-11-18)</small>
*{{icon|DYK}} ... that the '''[[Comaster schlegelii|variable bushy feather star]]''' is sometimes kept in a [[reef aquarium]] but usually dies because of [[starvation]]? <small>(2012-10-30)</small>
*{{icon|DYK}} ... that if an arm of a '''[[Comatulida|feather star]]''' ''(pictured)'' breaks off, then at least two will grow to replace it? <small>(2012-08-08)</small>
*{{icon|DYK}} ... that the '''[[common starfish]]''' can detect the odour of the predatory [[common sunstar]] and take evasive action? <small>(2013-10-09)</small>
*{{icon|DYK}} ... that [[Theodore Roosevelt]] attacked '''''[[Concealing-Coloration in the Animal Kingdom]]''''' for "wild absurdities" like the book's depiction of "camouflaged" [[roseate spoonbill]]s ''(pictured)''? <small>(2013-01-02)</small>
*{{icon|DYK}} ... that the defenses of the soft coral ''[[Leptogorgia virgulata]]'' are useless against the barnacle '''''[[Conopea galeata]]'''''{{-?}} <small>(2021-01-16)</small>
*{{icon|DYK}} ... that American [[primatology|primatologist]] '''[[Harold Jefferson Coolidge, Jr.|Harold J. Coolidge, Jr.]]''' was the inaugural vice president of the [[International Union for Conservation of Nature]] as well as a founding director of the [[World Wide Fund for Nature|World Wildlife Fund]]? <small>(2011-01-30)</small>
*{{icon|DYK}} ... that an amorous male [[box jellyfish]] '''''[[Copula (jellyfish)|Copula sivickisi]]''''' courts his selected mate and passes her a [[Spermatophore|bundle of sperm]]? <small>(2014-03-23)</small>
*{{icon|DYK}} ... that larvae of the '''[[Corella eumyota|orange-tipped sea squirt]]''' are brooded, and settle on the seabed close to the parent within minutes of being released? <small>(2017-10-08)</small>
*{{icon|DYK}} ... that the sea slug '''''[[Berthella ocellata]]''''' hides during the day and feeds on sponges such as '''''[[Corticium candelabrum]]''''' at night? <small>(2020-03-17)</small>
*{{icon|DYK}} ... that '''[[Corynactis viridis|jewel anemones]]''' split apart but stay together? <small>(2018-08-06)</small>
*{{icon|DYK}} ... that the eleven-armed starfish '''''[[Coscinasterias muricata]]''''' can reproduce by [[Fission (biology)|binary fission]], splitting apart to make two new individuals? <small>(2018-12-16)</small>
*{{icon|DYK}} ... that the majority of '''[[Coscinasterias tenuispina|blue spiny starfish]]''' reproduce sexually in winter, but [[asexual reproduction|asexually]] in the summer? <small>(2011-10-10)</small>
*{{icon|DYK}} ... that [[naturalist]] '''[[Jonathan Couch]]''' wrote the four-volume ''A History of the Fishes of the British Islands'', with his own coloured [[illustration]]s depicting the vivid natural colours of the different [[species]]? <small>(2007-12-20)</small>
*{{icon|DYK}} ... that '''[[crinoid]]s''' ''(example pictured)'' are closely related to [[sea urchin]]s and [[starfish]]? <small>(2019-05-13)</small>
*{{icon|DYK}} ... that the [[starfish]] '''''[[Cryptasterina pentagona]]''''' and '''''[[Cryptasterina hystera]]''''' are believed to have diverged from a common ancestral line a few thousand years ago? <small>(2013-06-06)</small>
*{{icon|DYK}} ... that as the colonial bryozoan '''''[[Cryptosula pallasiana]]''''' travels to new places, it takes its [[Okenia eolida|sea slugs]] with it? <small>(2016-03-16)</small>
*{{icon|DYK}} ... that the brain coral '''''[[Ctenella chagius]]''''' ''(pictured)'' lives far from the rest of its [[Family (biology)|family]]? <small>(2012-11-24)</small>
*{{icon|DYK}} ... that juvenile '''[[Culcita novaeguineae|cushion stars]]''' look so different from their seniors that they were thought to belong to a [[species]] in a different [[Family (biology)|biological family]]? <small>(2012-02-01)</small>
*{{icon|DYK}} ... that the '''[[Cyanea nozaki|ghost jellyfish]]''' may have a '''[[Alepas pacifica|goose barnacle]]''' hanging from its bell and little fish swimming among its [[tentacle]]s? <small>(2015-07-28)</small>
*{{icon|DYK}} ... that if the disc coral '''''[[Cycloseris cyclolites]]''''' gets buried in sediment, it can "float" itself free? <small>(2019-06-15)</small>
*{{icon|DYK}} ... that the free-living, solitary coral '''''[[Cycloseris distorta]]''''' ''(pictured)'' can subdivide its stony skeleton and form two new individuals? <small>(2019-07-03)</small>
*{{icon|DYK}} ... that the '''[[Cynarina|solitary cup coral]]''' can double its diameter by drawing water into its mantle? <small>(2013-06-12)</small>
*{{icon|DYK}} ... that the '''[[Leptophlebia marginata|sepia dun mayfly]]''' ''(pictured)'' can be an alternate [[Host (biology)|host]] for the nematode '''''[[Cystidicoloides tenuissima]]''''', a parasite of trout and salmon? <small>(2015-08-21)</small>
*{{icon|DYK}} ... that the deep sea, solitary '''''[[Dactylotrochus|Dactylotrochus cervicornis]]''''' ''(pictured)'' is now included in a family of otherwise shallow-water, [[Colony (biology)|colonial]] corals? <small>(2015-07-15)</small>
*{{icon|DYK}} ... that in 2012, a "'''[[Darwin (monkey)|stylish but illegal monkey]]'''" was seen wandering a Toronto-area [[IKEA]]? <small>(2023-02-04)</small>
*{{icon|DYK}} ... that the '''[[Davidaster rubiginosus|orange sea lily]]''' and the '''[[Davidaster discoideus|beaded crinoid]]''' conceal their bodies in crevices while they extend their arms to [[Filter feeder|filter feed]]? <small>(2012-09-09)</small>
*{{icon|DYK}} ... that the [[Octopus macropus|grass octopus]] ''(pictured)'' puts on a '''[[Deimatic behaviour|deimatic display]]''' of brownish red with white spots to scare predators? <small>(2013-01-09)</small>
*{{icon|DYK}} ... that larvae of the '''[[Dendrodoa grossularia|baked bean ascidian]]''' settle onto the tunics of adult individuals? <small>(2022-01-27)</small>
*{{icon|DYK}} ... that the deep sea '''[[Dermechinus|cactus urchin]]''' ''(pictured)'' may be a [[filter feeder]], a very unusual method of feeding for a sea urchin? <small>(2018-04-25)</small>
*{{icon|DYK}} ... that the '''[[destruction of ivory]]''' ''(pictured)'' has been called "indispensable in the fight against trafficking of threatened species"? <small>(2016-03-05)</small>
*{{icon|DYK}} ... that spines of the '''[[Diadema paucispinum|long-spined sea urchin]]''' can break off in the skin and cause a painful sting? <small>(2013-06-15)</small>
*{{icon|DYK}} ... that the '''[[Diadema savignyi|long-spined sea urchin]]''' ''(pictured)'' reacts to a shadow falling on it by angling its [[Spine (zoology)|spines]] towards the possible [[Predation|predator]]? <small>(2013-11-26)</small>
*{{icon|DYK}} ... that because the [[Indo-Pacific]] [[sea urchin]] '''''[[Diadema setosum]]''''' has been found in [[Turkey|Turkish]] waters, it is the first [[invasive species|invasive]] [[echinoid]] in the [[Mediterranean]]? <small>(2009-01-22)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Diadumene cincta]]''''' reproduces by [[Fragmentation (reproduction)|basal laceration]], with pieces of tissue becoming detached from the base and developing into new individuals? <small>(2018-09-04)</small>
*{{icon|DYK}} ... that the '''[[Diadumene leucolena|white anemone]]''' has been found growing in grooves in the shell of a [[loggerhead sea turtle]]? <small>(2017-07-31)</small>
*{{icon|DYK}} ... that '''[[Dichocoenia stokesi|pineapple coral]]''' growing in the [[Florida Keys]] was nearly wiped out by [[Aurantimonadaceae|white plague]] in 1995 and has not fully recovered since? <small>(2012-11-17)</small>
*{{icon|DYK}} ... that taxidermist '''[[James Dickinson (taxidermist)|James Dickinson]]''' [[taxidermy|mounted]] the '''[[Armley Hippo]]''' ''(pictured)'', a [[hippopotamus]] native to [[Yorkshire]] that is at least 113,000 years old? <small>(2021-08-28)</small>
*{{icon|DYK}} ... that new colonies of the '''[[Didemnum vexillum|carpet sea squirt]]''' can form by "dripping"? <small>(2015-02-03)</small>
*{{icon|DYK}} ... that '''[[Dinocochlea]]''' was thought to be a giant [[gastropod shell|snail shell]] or [[corprolite|fossilised dinosaur dung]] but is actually a [[concretion|solidified]] worm's burrow? <small>(2011-01-11)</small>
*{{icon|DYK}} ... that the '''[[Diopatra cuprea|decorator worm]]''' lives in a tube adorned with shell fragments and tiny pebbles? <small>(2017-08-09)</small>
*{{icon|DYK}} ... that the '''[[broadfish tapeworm]]''' is the longest [[tapeworm]] in humans, averaging ten [[metre]]s long and that it can shed up to a [[million]] eggs a day? <small>(2005-04-06)</small>
*{{icon|DYK}} ... that the starfish '''''[[Diplasterias brucei]]''''' broods its young until they have developed into juveniles? <small>(2017-03-08)</small>
*{{icon|DYK}} ... that small gobies are often associated with '''[[Diploastrea heliopora|Diploastrea brain coral]]''' ''(pictured)''? <small>(2017-01-25)</small>
*{{icon|DYK}} ... that when strongly stimulated, the earthworm '''''[[Diplocardia longa]]''''' is visible as a dark silhouette against the luminous slime it exudes? <small>(2014-12-07)</small>
*{{icon|DYK}} ... that at least five [[mutation]]s are known to cause '''[[diplopodia]]''' in [[chickens]], resulting in the development of extra toes or other structural abnormalities in the hind limbs? <small>(2008-11-29)</small>
*{{icon|DYK}} ... that the worms '''''[[Dipolydora commensalis]]''''' and '''''[[Neanthes fucata]]''''' have a [[commensalism|commensal]] relationship with their [[hermit crab]] hosts and are not attacked by them? <small>(2018-12-27)</small>
*{{icon|DYK}} ... that '''''[[Poralia|Poralia rufescens]]''''', a deepwater '''[[Discomedusae|discomedusan jellyfish]]''', is so fragile that most specimens brought to the surface are damaged? <small>(2018-07-16)</small>
*{{icon|DYK}} ... that '''[[displaced aggression]]''' is experienced by humans and animals? <small>(2022-07-23)</small>
*{{icon|DYK}} ... that the sea squirt '''''[[Distomus variolosus]]''''' colonises both fronds of [[kelp]] and the shells of crustaceans such as the [[Majoidea|spider crab]] ''[[Maja brachydactyla]]''? <small>(2022-05-07)</small>
*{{icon|DYK}} ... that the marine [[sponge]] '''''[[Dysidea arenaria]]''''' was originally described based on a single specimen collected near [[Palau]]? <small>(2015-09-23)</small>
*{{icon|DYK}} ... that among its red, pink, violet or white warts, the '''[[Echinaster callosus|warty sea star]]''' ''(pictured)'' has green [[pedicellaria]]? <small>(2018-07-08)</small>
*{{icon|DYK}} ... that the body wall of the '''[[Echinaster spinulosus|small spine sea star]]''' is composed of a [[latticework]] of [[collagen]] fibres and [[calcareous]] plates that give it both flexibility and rigidity? <small>(2012-11-01)</small>
*{{icon|DYK}} ... that the sea urchin '''''[[Echinocyamus pusillus]]''''' turns bright green when injured? <small>(2021-09-01)</small>
*{{icon|DYK}} ... that the [[sea urchin]] '''''[[Echinometra viridis]]''''' ''(pictured)'' hides in crevices while '''''[[Echinometra lucunter]]''''' and '''''[[Echinometra mathaei]]''''' dig themselves into the surrounding rocks? <small>(2012-10-03)</small>
*{{icon|DYK}} ... that '''[[Echinophyllia aspera|chalice coral]]''' and '''[[Oxypora lacera|porous lettuce coral]]''' can be confused underwater? <small>(2017-10-17)</small>
*{{icon|DYK}} ... that the [[sea urchin]] '''''[[Echinus tylodes]]''''' ''(pictured)'' lives among [[deep-water coral]]s up to {{convert|0.8|km|1|abbr=on}} below the ocean surface? <small>(2013-02-07)</small>
*{{icon|DYK}} ... that in the 1970s, '''[[Echiura|spoon worms]]''' ''(example pictured)'' helped promote [[biodiversity]] around the effluent outlets from the Los Angeles [[sewage]] system? <small>(2019-04-20)</small>
*{{icon|DYK}} ... that the burrowing and feeding of '''''[[Listriolobus pelodes]]''''', a marine '''[[Echiuroidea|spoon worm]]''', helped increase the [[biodiversity]] near [[Pollution|wastewater outlets]] off the coast of California? <small>(2012-12-03)</small>
*{{icon|DYK}} ... that the marine worm '''''[[Echiurus echiurus]]''''' uses its spoon-shaped proboscis to feed but not to dig its burrow? <small>(2019-03-20)</small>
*{{icon|DYK}} ... that the '''[[Ecteinascidia turbinata|mangrove tunicate]]''' produces an anti-tumour drug, [[trabectedin]], which becomes concentrated in the '''[[Maritigrella crozierae|tiger flatworm]]''' when it feeds on the [[tunicate]]? <small>(2012-04-27)</small>
*{{icon|DYK}} ... that '''[[Edwardsiella andrillae|a sea anemone]]''' was discovered mysteriously burrowed into the [[Ross Ice Shelf]] in 2010? <small>(2014-02-02)</small>
*{{icon|DYK}} ... that around the shores of [[Long Island]], the '''[[Haloclava producta|ghost anemone]]''' can cause "clam diggers' itch", while the '''[[Edwardsiella lineata|lined anemone]]''' is responsible for "seabather's eruption"? <small>(2017-08-05)</small>
*{{icon|DYK}} ... that '''[[Effect of psychoactive drugs on animals|after ingesting caffeine]]''', spiders fail to build a proper [[Spider web|web]] ''(see picture)''? <small>(2009-09-13)</small>
*{{icon|DYK}} ... that paleontologists have '''[[Timeline of egg fossil research|discovered]]''' the '''[[Egg taphonomy|fossilized]]''' '''[[Egg fossil|eggs]]''' of '''[[Cephalopod egg fossil|cephalopods]]''', '''[[Fish egg fossil|fishes]]''', and '''[[Reptile egg fossil|reptiles]]''', with some '''[[dinosaur eggs]]''' ''(pictured)'' being preserved with '''[[Egg paleopathology|pathological]]''' shell deformities? <small>(2013-09-09)</small>
*{{icon|DYK}} ... that the [[nematode]] '''''[[Elaeophora elaphi]]''''' is a [[parasite]] that infests the [[Liver|hepatic]] [[blood vessel]]s of [[Red Deer]] in [[Spain]]? <small>(2008-11-27)</small>
*{{icon|DYK}} ... that the [[nematode]] '''''[[Elaeophora poeli]]''''' is a [[Parasitism|parasite]] that is found in the [[heart]] or [[aorta]] of various species of [[cattle]]? <small>(2008-11-24)</small>
*{{icon|DYK}} ... that the [[nematode]] '''''[[Elaeophora sagitta]]''''' is a [[parasite]] that infests the [[heart]] and [[blood vessel]]s of animals such as [[African Buffalo|buffaloes]] and [[Greater Kudu|kudus]] in [[Africa]]? <small>(2008-11-27)</small>
*{{icon|DYK}} ... that male [[bryozoa]]ns '''''[[Electra pilosa]]''''' liberate sperm into the sea and females may actively collect this? <small>(2014-12-23)</small>
*{{icon|DYK}} ... that the life cycle of the '''[[Electra posidoniae|Neptune-grass bryozoan]]''' is synchronized with the growth cycle of the seagrass on which it lives and the availability of the [[phytoplankton]] on which it feeds? <small>(2020-12-27)</small>
*{{icon|DYK}} ... that the '''[[elephant of Henry III]]''' ''(pictured)'', which arrived in England in 1255, was the first to set foot in that country since the [[Roman conquest of Britain|Roman invasion of Britain]]? <small>(2022-11-02)</small>
*{{icon|DYK}} ... that '''[[Johan Hjalmar Théel]]''' discovered the sea cucumber '''''[[Elpidia glacialis]]''''' while on an expedition searching for the [[Northeast Passage]]? <small>(2014-12-15)</small>
*{{icon|DYK}} ... that before modern [[paleontology]] came about, fossils of '''''[[Encrinus]]''''' went by a number of names in Germany, including "sun wheels", "[[Saint Boniface]]'s pennies", and "witches' money"? <small>(2012-03-28)</small>
*{{icon|DYK}} ... that the parasite '''''[[Enteromyxum scophthalmi]]''''' causes a severe illness in farmed [[turbot]] for which no cure is known? <small>(2019-09-12)</small>
*{{icon|DYK}} ... that the [[Ediacaran]] [[Ediacara biota|organism]] '''''[[Eoandromeda]]''''' may represent the earliest animal [[fossil]] unless it turns out to be an [[alga]]? <small>(2008-11-02)</small>
*{{icon|DYK}} ... that '''[[Epiactis lisbethae|Lisbeth's brooding anemone]]''' and '''[[Epiactis fernaldi|Fernald's brooding anemone]]''' both care for their young, but they use different strategies? <small>(2017-12-31)</small>
*{{icon|DYK}} ... that the [[sea anemone]] '''''[[Epiactis prolifera]]''''' ''(pictured)'', starts life as a female and later becomes a [[hermaphrodite]]? <small>(2011-07-20)</small>
*{{icon|DYK}} ... that the leech '''''[[Erpobdella punctata]]''''' sometimes hitches a ride on a [[salamander]]? <small>(2018-06-15)</small>
*{{icon|DYK}} ... that the '''[[Euapta lappa|beaded sea cucumber]]''' moves by means of [[peristalsis]]? <small>(2012-10-18)</small>
*{{icon|DYK}} ... that the '''[[Eucidaris metularia|ten-lined urchin]]''' was one of several [[sea urchin|species]] used in research to determine the feasibility of using non-invasive [[magnetic resonance imaging|MRI]] technology to study the internal anatomy of echinoids? <small>(2013-04-17)</small>
*{{icon|DYK}} ... that the green worm '''''[[Eulalia viridis]]''''' does not breed until it is at least two years old? <small>(2017-08-26)</small>
*{{icon|DYK}} ... that the tubeworm '''''[[Eunice norvegica]]''''' often grows in association with a deep water coral? <small>(2017-07-29)</small>
*{{icon|DYK}} ... that when the '''[[Eupentacta quinquesemita|stiff-footed sea cucumber]]''' [[Evisceration (autotomy)|eviscerates]], it gets rid of the '''[[Thyonicola americana|parasitic sea snail]]''' which lives attached to its gut? <small>(2018-03-07)</small>
*{{icon|DYK}} ... that the young of the '''[[Euretaster insignis|striking sea star]]''' are nourished in a manner described as "cannibalistic ectoparasitism"? <small>(2019-04-26)</small>
*{{icon|DYK}} ... that the '''[[Eusmilia|smooth flower coral]]''' ''(pictured)'' only lives up to its name at night? <small>(2012-07-14)</small>
*{{icon|DYK}} ... that although the starfish '''''[[Evasterias troscheli]]''''' shelters juvenile [[Paralithodes camtschaticus|Alaskan king crabs]] between its arms, it is fed on by the adult crab? <small>(2012-05-23)</small>
*{{icon|DYK}} ... that living '''[[Aiptasia pallida|glass anemones]]''' can be dissected in the laboratory and then put back in an aquarium, where they will [[Regeneration (biology)|heal]]? <small>(2017-07-14)</small>
*{{icon|DYK}} ... that about 22% of all '''[[Fauna of Colombia|reported species of mammals]]''' in [[Colombia]] are [[Endangered species|endangered]] or [[Critically endangered species|critically endangered]]? <small>(2007-10-07)</small>
*{{icon|DYK}} ... that '''[[fauna of Bangladesh]]''' includes ''Trigona fuscobaltiata'', the only species of [[stingless bee]]s found in the country? <small>(2013-06-03)</small>
*{{icon|DYK}} ... that the native [[mammal]] '''[[fauna of Puerto Rico]]''' consists exclusively of [[bat]]s? <small>(2006-08-16)</small>
*{{icon|DYK}} ... that the '''[[Platygyra daedalea|lesser valley coral]]''' attacks and may kill less aggressive species, such as the '''[[Favites complanata|larger star coral]]'''? <small>(2015-06-29)</small>
*{{icon|DYK}} ... that '''''[[Favites pentagona]]''''' uses its sweeper tentacles armed with [[Cnidocyte|stinging cells]] to prevent other corals from crowding it? <small>(2015-05-21)</small>
*{{icon|DYK}} ... that the "Cuddle with a Koala" experience at '''[[Featherdale Wildlife Park]]''' was stopped in 1988 when [[New South Wales]] law was changed to restrict koala handling? <small>(2021-07-23)</small>
*{{icon|DYK}} ... that the aggressively [[invasive species|invasive]] '''[[Ficopomatus enigmaticus|Australian tubeworm]]''' ''(pictured)'' can be an [[ecosystem engineer]] and cause [[biofouling|biological fouling]]? <small>(2013-11-21)</small>
*{{icon|DYK}} ... that larvae of the coral '''''[[Flabellum curvatum]]''''' are expelled from its mouth at an advanced stage of development, and settle nearby? <small>(2017-09-11)</small>
*{{icon|DYK}} ... that feather stars such as '''''[[Florometra serratissima]]''''' use their arms to catch food and also to swim? <small>(2017-12-12)</small>
*{{icon|DYK}} ... that '''''[[Flustra foliacea]]''''' looks like a [[seaweed]] but is actually a [[colony (biology)|colony of animals]]? <small>(2011-08-13)</small>
*{{icon|DYK}} ... that [[Charles Darwin]]'s '''[[The Formation of Vegetable Mould through the Action of Worms|final scientific book]]''' discussed the formation of [[earthworm#Locomotion and importance to soil|mould]] through the action of [[earthworm]]s? <small>(2009-02-13)</small>
*{{icon|DYK}} ... that the extinct ants '''''[[Azteca alpha]]''''' carried larvae of the nematode '''''[[Formicodiplogaster|Formicodiplogaster myrmenema]]'''''? <small>(2014-11-22)</small>
*{{icon|DYK}} ... that '''[[Fortress of the Bear]]'''{{`s}} founder raised pigs to prove he could take care of bears? <small>(2023-03-09)</small>
*{{icon|DYK}} ... that '''[[fossil echinoids]]''' ''(example pictured)'' [[Biostratigraphy|can be used to date]] the various chalk strata of the [[White Cliffs of Dover]]? <small>(2021-03-18)</small>
*{{icon|DYK}} ... that the [[Bathyal zone|bathypelagic]] starfish '''''[[Freyella elegans]]''''' is probably not a [[Filter feeder|suspension feeder]]? <small>(2018-12-01)</small>
*{{icon|DYK}} ... that when sick, '''[[Galaxea fascicularis|galaxy coral]]''' can be fed [[Artemia salina|brine shrimps]] incorporating specific [[Antibacterial|antibiotics]]? <small>(2011-12-24)</small>
*{{icon|DYK}} ... that human activity has [[introduced species|helped]] the '''[[Gelliodes wilsoni|gray encrusting sponge]]''' to [[Biological dispersal|disperse]] across the Pacific? <small>(2016-05-18)</small>
*{{icon|DYK}} ... that the deep-sea [[coral]] species '''''[[Gersemia juliepackardae]]''''' was named for '''[[Julie Packard]]''' ''(pictured)'', executive director of [[Monterey Bay Aquarium]], for her work as an [[Marine conservation|ocean conservationist]]? <small>(2019-05-31)</small>
*{{icon|DYK}} ... that the '''[[giant barrel sponge]]''' may live up to 2,300 years, making it one of the longest-living animals? <small>(2013-07-23)</small>
*{{icon|DYK}} ... that the extinct '''''[[Gigantoproductus giganteus]]''''' was the largest known species of [[brachiopod]]? <small>(2013-03-01)</small>
*{{icon|DYK}} ... that the [[Permian]] [[Therocephalia|therocephalian]] '''''[[Glanosuchus]]''''', an early relative of mammals, may have been [[Endotherm|warm-blooded]]? <small>(2011-03-30)</small>
*{{icon|DYK}} ... that 17th-century entomologist '''[[Eleanor Glanville]]''' raised her own moths and butterflies, and wrote some of the earliest detailed descriptions of butterfly rearing? <small>(2022-07-25)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Gonactinia|Gonactinia prolifera]]''''' can both walk and swim? <small>(2017-07-15)</small>
*{{icon|DYK}} ... that the sea urchin '''''[[Goniocidaris umbraculum]]''''' moves its eggs with its [[tube feet]], assisted by [[Cilium|cilia]], to an area near its mouth where they can be [[Egg incubation|brooded]]? <small>(2020-07-27)</small>
*{{icon|DYK}} ... that the only known fossil of '''''[[Gordodon]]''''' ''(pictured)'' had its skull accidentally sawed in half while it was being excavated? <small>(2021-04-24)</small>
*{{icon|DYK}} ... that the '''[[Gorgonia flabellum|Venus sea fan]]''' ''(pictured)'' feeds by catching [[plankton]] that drift past? <small>(2012-10-17)</small>
*{{icon|DYK}} ... that '''''[[Gorgonia mariae]]''''' ''(pictured)'' is one of several species of sea fans affected by a terrestrial [[Aspergillosis|fungal disease]] in the Gulf of Mexico? <small>(2017-07-26)</small>
*{{icon|DYK}} ... that the nudibranch '''''[[Tritonia hamnerorum]]''''' feeds exclusively on the '''[[Gorgonia ventalina|purple sea fan]]'''? <small>(2012-10-23)</small>
*{{icon|DYK}} ... that a '''[[sea fan]]''' is a form of [[sessile]] [[colony|colonial]] [[cnidaria]]n, similar to a [[sea pen]] or a soft [[coral]], found in [[tropical]] and [[subtropical]] seawater? <small>(2005-08-23)</small>
*{{icon|DYK}} ... that the [[basket star]], '''''[[Gorgonocephalus eucnemis]]''''' ''(pictured)'', resembles an animated [[Shrub|bush]] when trying to catch [[Predation|prey]]? <small>(2012-01-31)</small>
*{{icon|DYK}} ... that '''''[[Gorgonorhynchus repens]]''''' has an unusual sticky, branched [[proboscis]] with which it snares its prey? <small>(2018-11-24)</small>
*{{icon|DYK}} ... that one night in 1857 '''[[Granny (sea anemone)|Granny]]''' gave birth to 240 offspring? <small>(2021-08-15)</small>
*{{icon|DYK}} ... that the '''[[gun-powered mousetrap]]''' never gained wide popularity after being patented in 1882, but was hailed as the "best mousetrap ever" in 2012? <small>(2022-11-22)</small>
*{{icon|DYK}} ... that '''[[Okmulgee State Park]]''' ''(pictured)'' in [[Oklahoma]] is one of only a few places in the world where the fossil [[coral]] '''''[[Gymnophyllum wardi]]''''' is found? <small>(2010-10-06)</small>
*{{icon|DYK}} ... that the freshwater leech '''''[[Haemopis sanguisuga]]''''' sometimes emerges from the water to hunt for earthworms? <small>(2021-08-26)</small>
*{{icon|DYK}} ... that the '''[[Halecium halecinum|herring-bone hydroid]]''' has two types of feeding [[polyp]] which differ in their behaviour? <small>(2018-11-26)</small>
*{{icon|DYK}} ... that the '''[[Halecium muricatum|sea hedgehog hydroid]]''' is [[Predation|predated]] by the [[nudibranch]] ''[[Zelentia pustulata]]'', which feeds on it and winds egg coils around its branches? <small>(2018-11-21)</small>
*{{icon|DYK}} ... that the [[jellyfish]] '''''[[Haliclystus auricula]]''''' acquired the common name "Kaleidoscope" from a naming contest held in Britain? <small>(2010-08-27)</small>
*{{icon|DYK}} ... that the sponge '''''[[Halisarca caerulea]]''''' forms part of a "sponge loop", absorbing large quantities of [[dissolved organic carbon]], and returning the carbon to the sea as [[detritus]]? <small>(2020-10-22)</small>
*{{icon|DYK}} ... that the '''[[Halocynthia igaboja|sea hedgehog]]''' is a cannibal? <small>(2019-06-28)</small>
*{{icon|DYK}} ... that an individual [[Demosponge|sponge]], '''''[[Neofibularia nolitangere]]''''', may have tens of thousands of [[Parasitism|parasitic]] [[Polychaete|worms]], '''''[[Haplosyllis spongicola]]''''', living within its tissues? <small>(2012-08-16)</small>
*{{icon|DYK}} ... that the '''[[Hediste diversicolor|ragworm]]''' changes colour from brown to green as the breeding season approaches? <small>(2013-05-20)</small>
*{{icon|DYK}} ... that the multi-armed '''''[[Heliaster helianthus]]''''' sheds several of its arms when attacked by the six-armed predatory starfish '''''[[Meyenaster|Meyenaster gelatinosus]]'''''? <small>(2018-06-28)</small>
*{{icon|DYK}} ... that in 1978, populations of the '''[[Heliaster kubiniji|gulf sea star]]''' in the [[Gulf of California]] were devastated by '''[[starfish wasting disease]]''' and had not fully recovered twenty years later? <small>(2013-11-24)</small>
*{{icon|DYK}} ... that the coral '''''[[Heliofungia actiniformis]]''''' ''(pictured)'' is only attached to the seabed as a juvenile? <small>(2015-08-11)</small>
*{{icon|DYK}} ... that 40 or more fish leeches of the species '''''[[Hemibdella soleae]]''''' may be found attached to one [[common sole]]? <small>(2018-05-11)</small>
*{{icon|DYK}} ... that larvae of the sea urchin '''''[[Hemicentrotus|Hemicentrotus pulcherrimus]]''''' are stimulated to settle on the seabed when they detect traces of certain algae in the water? <small>(2018-04-29)</small>
*{{icon|DYK}} ... that the majority of '''[[Henricia oculata|Bloody Henry starfish]]''' are host to a [[Asterocheres lilljeborgi|parasitic copepod]]? <small>(2018-07-20)</small>
*{{icon|DYK}} ... how salamanders '''[[Henry Street salamander tunnels|cross the road]]''' ''(pictured)''{{-?}} <small>(2024-06-17)</small>
*{{icon|DYK}} ... that two male penguins from '''[[Heythrop Zoological Gardens]]''' were "married" in February&nbsp;2019? <small>(2021-07-24)</small>
*{{icon|DYK}} ... that [[Conrad Gessner]]'s 1551 book '''''[[Historiae animalium (Gesner)|Historiae animalium]]''''' is the first use of [[fossil]] illustrations ''(pictured)''? <small>(2008-09-22)</small>
*{{icon|DYK}} ... that the '''[[Holothuria atra|black sea cucumber]]''' can split into two by transverse [[Fission (biology)|fission]]? <small>(2012-01-30)</small>
*{{icon|DYK}} ... that the '''[[Holothuria edulis|pink and black sea cucumber]]''' ''(pictured)'' is eaten as "[[Sea cucumber (food)|bêche-de-mer]]" in China and Indonesia? <small>(2013-04-06)</small>
*{{icon|DYK}} ... that the '''[[Holothuria forskali|black sea cucumber]]''' releases [[saponin|special chemicals]] into the water to warn potential [[Predation|predators]] that it may taste bad? <small>(2011-08-08)</small>
*{{icon|DYK}} ... that the '''[[Holothuria fuscocinerea|ashy pink sea cucumber]]''' obtains its nourishment from swallowing sand? <small>(2018-04-06)</small>
*{{icon|DYK}} ... that the '''[[Holothuria fuscopunctata|elephant trunkfish]]''' ''(pictured)'' grazes on the seabed and can weigh up to {{convert|4.5|kg|lb|0|abbr=on}}? <small>(2018-04-30)</small>
*{{icon|DYK}} ... that the '''[[Holothuria glaberrima|brown rock sea cucumber]]''' has been used in [[Regeneration (biology)|regeneration]] research? <small>(2021-10-13)</small>
*{{icon|DYK}} ... that when the sea cucumber '''''[[Holothuria hilla]]''''' reproduces by [[Fission (biology)|fission]], the regenerated part is often paler in colour than the original one? <small>(2020-09-02, 2021-09-02)</small>
*{{icon|DYK}} ... that the '''[[Holothuria impatiens|impatient sea cucumber]]''' readily expels sticky white [[cuvierian tubules]] when handled? <small>(2021-10-12)</small>
*{{icon|DYK}} ... that the '''[[Holothuria leucospilota|black sea cucumber]]''' ''(pictured)'' can emit a mass of sticky '''[[cuvierian tubules]]''' to enmesh a potential [[predation|predator]]? <small>(2013-03-13)</small>
*{{icon|DYK}} ... that the '''[[Holothuria parvula|golden sea cucumber]]''' is able to [[Asexual reproduction|reproduce asexually]] by [[Fission (biology)|splitting in half]]? <small>(2013-03-03)</small>
*{{icon|DYK}} ... that the sea cucumber '''''[[Holothuria poli]]''''' may have reached the [[Red Sea]] by travelling through the [[Suez Canal]]? <small>(2021-04-17)</small>
*{{icon|DYK}} ... that up to 167 small [[Bivalvia|bivalve shells]], '''''[[Entovalva nhatrangensis]]''''', have been found living inside the [[oesophagus]] of a '''[[Holothuria spinifera|brown sandfish]]'''? <small>(2012-05-16)</small>
*{{icon|DYK}} ... that the '''[[Holothuria thomasi|tiger's tail]]''' uses its [[tentacle]]s to push [[detritus]], sand and gravel into its mouth? <small>(2012-01-25)</small>
*{{icon|DYK}} ... that the '''[[Holothuria tubulosa|tubular sea cucumber]]''' ''(pictured)'' [[Spawn (biology)|spawns]] at the time of the [[full moon]]? <small>(2012-01-22)</small>
*{{icon|DYK}} ... that the [[Biological life cycle|life cycle]] of the [[Parasitism|parasitic]] marine fluke '''''[[Homalometron pallidum]]''''' involves three different [[Host (biology)|hosts]], one of which is the [[mummichog]]? <small>(2012-03-18)</small>
*{{icon|DYK}} ... that the Antarctic [[Demosponge|sponge]] '''''[[Homaxinella balfourensis]]''''' prevents ice crystals from forming in its cells by the use of peptides with [[Antifreeze protein|antifreeze]] properties? <small>(2012-03-08)</small>
*{{icon|DYK}} ... that '''[[Horastrea|blister coral]]''' was not recognised as a new species until 1971? <small>(2017-10-19)</small>
*{{icon|DYK}} ... that the flatworm '''''[[Humbertium covidum]]''''' ''(pictured)'', named after the [[COVID-19 pandemic|{{nowrap|COVID-19}} pandemic]], was classified in a study written mostly during the initial lockdown? <small>(2022-03-05)</small>
*{{icon|DYK}} ... that [[George Orwell]] described the '''[[Hyde Park pet cemetery]]''' as "perhaps the most horrible spectacle in Britain"? <small>(2021-01-15)</small>
*{{icon|DYK}} ... that [[larva]]e of the tube worm '''''[[Hydroides ezoensis]]''''' prefer to settle on a [[Substrate (biology)|substrate]] already inhabited by other worms of their own species? <small>(2020-03-13)</small>
*{{icon|DYK}} ... that a {{cvt|10|cm3|1|adj=on}} sponge '''''[[Hymeniacidon kitchingi]]''''' can filter {{cvt|22.5|l|impgal U.S.gal|0|abbr=on}} of water per day? <small>(2020-09-17)</small>
*{{icon|DYK}} ... that the [[Parasitism|parasitic]] flatworm '''''[[Hymenolepis microstoma]]''''' ''(pictured)'' has [[stem cell]]s in its neck region that generate new body segments in a process called [[strobilation]]? <small>(2011-02-09)</small>
*{{icon|DYK}} ... that the '''[[Icelandic Phallological Museum]]''' collection of penises includes 55 from whales but only one from ''Homo sapiens''? <small>(2011-08-03)</small>
*{{icon|DYK}} ... that the [[starfish]] '''''[[Iconaster longimanus]]''''' produces large eggs which develop directly into juveniles without an intervening [[larva]]l stage? <small>(2013-05-19)</small>
*{{icon|DYK}} ... that the giant spoon worm '''''[[Ikeda taenioides]]''''' survived a [[tsunami]] that devastated other members of the seabed community? <small>(2019-03-26)</small>
*{{icon|DYK}} ... that '''[[infanticide (zoology)|infanticide]]''' is committed by animals as diverse as [[gray langur]]s, [[pig]]s, [[jacana]]s and [[giant water bug|water bug]]s? <small>(2007-07-17)</small>
*{{icon|DYK}} ... that although [[Hemiptera|true bugs]] eat [[aphid]]s, they help the aphids by '''[[intraguild predation|eating another predator]]''', young [[neuroptera|lacewings]]? <small>(2011-03-30)</small>
*{{icon|DYK}} ... that the '''[[Parazoanthus swiftii|golden zanthid]]''', a [[Colony (biology)|colonial]] [[coral]], often grows on the surface of the '''[[Iotrochota birotulata|green finger sponge]]? <small>(2012-08-13)</small>
*{{icon|DYK}} ... that '''''[[Ircinia strobilina]]''''' produces a substance which causes [[paralysis]] and loss of [[balance (ability)|balance]] when ingested by fish? <small>(2010-06-17)</small>
*{{icon|DYK}} ... that the light-dependent '''[[Isophyllia sinuosa|sinuous cactus coral]]''' ''(pictured)'' is an aggressive species that attacks neighbouring [[coral]]s to keep from being over-shadowed? <small>(2013-02-27)</small>
*{{icon|DYK}} ... that if unfavorable water conditions cause the [[coral]] species '''''[[Acropora palifera]]''''' to become dissociated from its [[Symbiodinium|algal symbiont]]s, it will undergo [[Coral bleaching|bleaching]] and be prone to disease and death? <small>(2013-03-20)</small>
*{{icon|DYK}} ... that the [[nudibranch]] '''''[[Tritoniella|Tritoniella belli]]''''' is avoided by several predatory starfishes but is inefficiently preyed on by the sea anemone '''''[[Isotealia antarctica]]'''''? <small>(2019-10-04)</small>
*{{icon|DYK}} ... that [[Saudi Arabia]]n officials detained a [[vulture]] ''(example pictured)'' and accused it of '''[[Israeli animal spy conspiracy theories|spying for Israel]]'''? <small>(2011-01-16)</small>
*{{icon|DYK}} ... that between 1979 and 1989, the '''[[ivory trade]]''' was primarily responsible for the death of more than 500,000 [[elephant]]s? <small>(2011-02-03)</small>
*{{icon|DYK}} ... that '''[[Janaria|staghorn hydrocoral]]''' grows on a mollusc shell occupied by a [[hermit crab]]? <small>(2019-05-02)</small>
*{{icon|DYK}} ... that '''[[jellyfish]]''' can disable power stations? <small>(2018-11-28)</small>
*{{icon|DYK}} ... that '''[[jellyfish bloom]]s''' can clog coastal power plants, causing losses of thousands of US dollars per day? <small>(2020-01-13)</small>
*{{icon|DYK}} ... that '''''[[Kaburakia excelsa]]''''', from the west coast of North America, is one of the largest flatworms in the world? <small>(2017-11-16)</small>
*{{icon|DYK}} ... that the [[Honey Monster Puffs#History|Sugar Puffs bear]] once escaped from '''[[Clinton Keeling]]'''{{`s}} home zoo? <small>(2022-10-24)</small>
*{{icon|DYK}} ... that the most [[Cosmopolitan distribution|widely distributed]] and commonest [[rotifer]] is probably '''''[[Keratella cochlearis]]'''''? <small>(2012-12-06)</small>
*{{icon|DYK}} ... that on this day, Nepali people '''[[Kukur Tihar|worship dogs]]''' ''(example pictured)'' to please [[Yama (Hinduism)|Yama]]? <small>(2020-11-14)</small>
*{{icon|DYK}} ... that '''''[[Kulindroplax]]''''' is the first known mollusk showing an unambiguous combination of exterior shells and a worm-like body? <small>(2012-11-21)</small>
*{{icon|DYK}} ... that the [[starfish]] '''''[[Labidiaster annulatus]]''''' ''(pictured)'' uses some of its many rays as [[fishing rod]]s? <small>(2012-07-19)</small>
*{{icon|DYK}} ... that '''''[[Pectinaria australis]]''''', a [[marine biology|marine]] [[ice cream cone worm]] of [[New Zealand]], builds a delicate tube home from sand grains only one grain thick? <small>(2007-04-08)</small>
*{{icon|DYK}} ... that in [[Liverpool Bay]], the '''[[Abra alba|white furrow shell]]''', the '''[[Phaxas pellucidus|transparent razor shell]]''' and the '''[[Lagis koreni|trumpet worm]]''' live side by side beneath the sand? <small>(2011-08-17)</small>
*{{icon|DYK}} ... that the tissues of the '''[[Lebrunia coralligens|hidden anemone]]''' contain [[Symbiosis|symbiotic]] [[zooxanthellae|single-celled algae]]? <small>(2014-04-22)</small>
*{{icon|DYK}} ... that the '''[[Mithraculus cinctimanus|anemone crab]]''' often lives in close association with the [[sea anemone]] '''''[[Lebrunia danae]]'''''? <small>(2012-10-29)</small>
*{{icon|DYK}} ... that some '''[[leech]]es''' feed only twice a year? <small>(2018-07-31)</small>
*{{icon|DYK}} ... that colonies of the black coral '''''[[Leiopathes glaberrima]]''''' can live for over four thousand years? <small>(2017-07-13)</small>
*{{icon|DYK}} ... that the slots in the [[Test (biology)|test]] of the '''[[Leodia sexiesperforata|six-holed keyhole urchin]]''' may help prevent it from being washed away by the current? <small>(2018-10-18)</small>
*{{icon|DYK}} ... that the [[bioluminescence|bioluminescent]] scales of the worm '''''[[Lepidonotus squamatus]]''''' adhere to any predator that feeds on it, making the attacker more visible to its own predators? <small>(2018-09-12)</small>
*{{icon|DYK}} ... that the '''[[Leptasterias hexactis|six-rayed star]]''' often has to compete with the larger [[Pisaster ochraceus|ochre starfish]] for food? <small>(2012-02-16)</small>
*{{icon|DYK}} ... that the [[starfish]] '''''[[Leptasterias polaris]]''''' and '''''[[Leptasterias tenera]]''''' both brood their developing [[Egg (biology)|eggs]]? <small>(2012-10-04)</small>
*{{icon|DYK}} ... that the '''[[Leptogorgia hebes|regal sea fan]]''' takes part in [[Reproductive synchrony|mass spawning]] events which may be triggered by the full moon? <small>(2012-07-08)</small>
*{{icon|DYK}} ... that the '''[[Leptogorgia virgulata|sea whip]]''', a [[Colony (biology)|colonial]] [[Alcyonacea|soft coral]], produces chemicals which prevent [[algae]], [[barnacle]]s and [[bryozoa]]ns from growing on it? <small>(2011-12-13)</small>
*{{icon|DYK}} ... that the barnacle, ''[[Pyrgoma anglicum]]'', is often found living parasitically inside the '''[[Leptopsammia pruvoti|sunset cup coral]]''' ''(pictured)''? <small>(2015-01-11)</small>
*{{icon|DYK}} ... that '''[[life]]''' exists in every part of the [[biosphere]], from the deepest parts of the ocean ''(bacterium pictured)'' to altitudes of up to 40 miles (64&nbsp;km) in the atmosphere? <small>(2023-11-05)</small>
*{{icon|DYK}} ... that the leech '''''[[Limnatis nilotica]]''''' can affect humans and livestock, entering hosts through the mouth, nose, or other orifices? <small>(2020-05-12)</small>
*{{icon|DYK}} ... that the '''[[Linckia multifora|spotted Linckia]]''' ''(pictured)'' frequently reproduces by [[autotomy|self amputating]] an arm, which then grows into a new individual? <small>(2011-10-02)</small>
*{{icon|DYK}} ... that [[bacteriologist]] '''[[Maria von Linden]]''' received a patent for her discovery that copper salts could be used as a disinfectant? <small>(2015-12-01)</small>
*{{icon|DYK}} ... that the '''[[Lineus sanguineus|banded nemertean]]''' ribbon worm readily breaks into pieces, each of which can regenerate into a new individual within four weeks? <small>(2017-10-18)</small>
*{{icon|DYK}} ... that the '''[[Lion's Mane Jellyfish]]''' is the biggest [[jellyfish]] in the world? <small>(2004-05-19)</small>
*{{icon|DYK}} ... that no [[Fungus|fungi]] or [[algae]] are '''[[List of endangered and threatened animals and plants of Illinois|listed as endangered or threatened by the Illinois Endangered Species Protection Board]]'''? <small>(2020-02-04)</small>
*{{icon|DYK}} ... that [[polyp]]s of the '''[[Lobophyllia corymbosa|brain root coral]]''' ''(skeleton pictured)'' can recognise their [[Cloning|clones]] and "help" them when they need assistance? <small>(2013-03-05)</small>
*{{icon|DYK}} ... that adjacent colonies of the '''[[Lobophyllia hemprichii|lobed brain coral]]''' ''(pictured)'' may grow together to form a composite [[Colony (biology)|colony]]? <small>(2015-01-17)</small>
*{{icon|DYK}} ... that '''''[[Lucernaria janetae]]''''' has eight [[lance]]-shaped [[gonad]]s? <small>(2010-10-01)</small>
*{{icon|DYK}} ... that the '''[[Luidia ciliaris|seven armed starfish]]''' ''(pictured)'' can "walk" and does not have an [[anus]]? <small>(2011-09-06)</small>
*{{icon|DYK}} ... that the '''[[Luidia clathrata|gray sea star]]''' ''(pictured)'' can be found eating the '''[[Mulinia lateralis|coot clam]]''' in [[Tampa Bay|Tampa Bay, Florida]]? <small>(2012-02-03)</small>
*{{icon|DYK}} ... that the '''[[Luidia foliolata|sand star]]''' can move across the [[seabed]] at the fast speed of {{convert|280|cm|ft}} per minute? <small>(2012-10-02)</small>
*{{icon|DYK}} ... that the starfish '''''[[Luidia maculata]]''''' eats its prey whole, and often leaves behind inedible fragments in the hollow in which it was lying? <small>(2021-11-23)</small>
*{{icon|DYK}} ... that in the kelp forests off the coast of Chile, '''[[Tetrapygus|sea urchins]]''' graze on the '''[[Lessonia trabeculata|kelp]]''', and '''[[Luidia magellanica|starfish]]''' prey on the sea urchins? <small>(2018-07-21)</small>
*{{icon|DYK}} ... that while '''''[[Luidia superba]]''''' usually has five limbs, '''''[[Luidia magnifica]]''''' ''(pictured)'' can have ten or eleven? <small>(2012-01-23)</small>
*{{icon|DYK}} ... that the starfish '''''[[Luidia quinaria]]''''' ''(pictured)'' produces the steroid [[saponin|asterosaponin]], which may help in treating coughs and [[asthma]]? <small>(2013-01-19)</small>
*{{icon|DYK}} ... that the starfish '''''[[Luidia savignyi]]''''' feeds on sea urchins and starfish, swallowing its prey whole? <small>(2022-01-11)</small>
*{{icon|DYK}} ... that the '''[[Luidia senegalensis|nine-armed sea star]]''' can turn its stomach inside out and engulf "mouthfuls" of [[sediment]] and [[detritus]]? <small>(2012-06-29)</small>
*{{icon|DYK}} ... that a young spider crab, '''''[[Libinia ferreirae]]''''', often lives inside the bell of the [[jellyfish]] '''''[[Lychnorhiza lucerna]]'''''? <small>(2012-04-06)</small>
*{{icon|DYK}} ... that the [[trematoda|fluke]] '''''[[Lyperosomum intermedium]]''''' infects the [[marsh rice rat]], although its relatives mostly infect birds? <small>(2010-04-15)</small>
*{{icon|DYK}} ... that aggregations of '''[[Lytechinus pictus|painted urchin]]''' have been recorded with a density of 80 individuals per square metre? <small>(2018-10-22)</small>
*{{icon|DYK}} ... that the '''[[Lytechinus variegatus|green sea urchin]]''' ''(pictured)'' shades itself from the sun with bits of vegetation and shell but the '''[[Lytechinus williamsi|jewel sea urchin]]''' prefers to hide in crevices during the day? <small>(2012-09-18)</small>
*{{icon|DYK}} ... that in 2015, the soft coral '''''[[Maasella edwardsi]]''''' was reported in the Aegean Sea for the first time? <small>(2015-07-09)</small>
*{{icon|DYK}} ... that '''''[[Macrobiotus shonaicus]]''''', a Japanese [[Tardigrade|water bear]], was first found in the parking lot of the apartment building where one of the researchers lived? <small>(2018-04-16)</small>
*{{icon|DYK}} ... that since the '''[[Konin Lakes]]''' became hotter, non-native species which have become established there include '''[[Macrostomum rostratum|one species of flatworm]]''', three of [[bryozoa]], three of [[crustacean]], seven of [[mollusca]], and at least six species of fish? <small>(2018-12-15)</small>
*{{icon|DYK}} ... that the coral '''''[[Madracis auretenra]]''''' has been used to study the likely effects of [[ocean acidification]] on corals? <small>(2015-06-15)</small>
*{{icon|DYK}} ... that [[hypertrophy|hypertrophied]] skeletons of the [[deep water coral]] '''''[[Madrepora oculata]]''''' ''(pictured)'' were thought to be signs of the first [[neoplasm]] to be discovered in [[coral]], but are now reinterpreted as an internal [[gall]]? <small>(2009-11-07)</small>
*{{icon|DYK}} ... that the '''[[Maeotias|Black Sea jellyfish]]''' has become established in the estuaries of the [[Petaluma River|Petaluma]] and [[Napa River]]s flowing into [[San Francisco Bay]]? <small>(2014-02-06)</small>
*{{icon|DYK}} ... that the [[Champawat Tiger|Champawat tigress]] and the [[Tsavo maneaters|Tsavo lions]] had suffered injuries that disabled them from pursuing their natural prey, leading them to become '''[[Man-eater|man-eaters]]'''? <small>(2007-11-26)</small>
*{{icon|DYK}} ... that '''[[Manicina|rose coral]]''' ''(skeleton pictured)'', a member of the '''[[Mussidae]]''' family, can right itself if it gets turned over? <small>(2017-09-17)</small>
*{{icon|DYK}} ... that both '''[[Meandrina meandrites|maze coral]]''' ''(pictured)'' and '''[[Manicina areolata|rose coral]]''' have a form that is unattached to the [[seabed]] and that rose coral can right itself if it gets overturned? <small>(2012-11-22)</small>
*{{icon|DYK}} ... that the '''''[[Marivagia stellata]]''''', a new [[genus]] and [[species]] of [[jellyfish]], was identified in the summer of 2010? <small>(2010-10-27)</small>
*{{icon|DYK}} ... that '''''[[Marrus orthocanna]]''''' ''(pictured)'' is a [[siphonophorae|colonial animal]] composed of [[zooid|smaller animals]] arranged on a stem? <small>(2011-10-13)</small>
*{{icon|DYK}} ... that the burrow of the [[Echiura|spoon worm]] '''''[[Maxmuelleria lankesteri]]''''' is sometimes modified by fish and crustaceans that take up occupancy there? <small>(2019-05-03)</small>
*{{icon|DYK}} ... that larvae of the '''[[Mediaster aequalis|vermilion sea star]]''' ''(pictured)'' preferentially settle among the tubes of '''[[Phyllochaetopterus prolifica|a tube-dwelling worm]]'''? <small>(2017-11-02)</small>
*{{icon|DYK}} ... that the [[mitochondrial DNA]] molecules of '''[[Medusozoa]]''' are linear rather than circular as in almost all other animals? <small>(2018-10-09)</small>
*{{icon|DYK}} ... that the '''[[Melithaea ochracea|knotted fan coral]]''' ''(pictured)'' is used in the creation of [[jewellery]]? <small>(2012-03-13)</small>
*{{icon|DYK}} ... that some microorganisms '''[[Mellivory|consume honey]]''' despite it having antimicrobial qualities? <small>(2022-10-08)</small>
*{{icon|DYK}} ... that the '''[[Meoma ventricosa|red heart urchin]]''' feeds on the film of algae and bacteria that surrounds grains of sand? <small>(2012-10-18)</small>
*{{icon|DYK}} ... that only the female '''[[Mermis nigrescens|grasshopper nematode]]''' ''(pictured)'' has an eye? <small>(2013-09-28)</small>
*{{icon|DYK}} ... that a [[parasitism|parasitic]] worm of the family '''[[Mermithidae]]''' ''(pictured)'' has been found in a [[spider]] preserved in [[Baltic amber]] for 40&nbsp;million years? <small>(2008-11-29)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Mesacmaea mitchellii]]''''' uses the base of its column to burrow into the sediment? <small>(2018-12-09)</small>
*{{icon|DYK}} ... that [[Bivalvia|bivalve molluscs]] and [[brittle star]]s are often found in beds of '''[[Metacrinus rotundus|Japanese sea lilies]]'''? <small>(2012-11-22)</small>
*{{icon|DYK}} ... that the trematode '''''[[Metorchis conjunctus]]''''' can cause disease in fish-eating mammals including humans? <small>(2016-01-20)</small>
*{{icon|DYK}} ... that the sea anemone '''''[[Metridium dianthus]]''''' is parasitised by the sea spider '''''[[Pycnogonum litorale]]'''''? <small>(2021-09-18)</small>
*{{icon|DYK}} ... that the '''[[Metridium farcimen|giant plumose anemone]]''' ''(pictured)'' can grow to a height of one metre ({{nowrap|39 inches}})? <small>(2011-12-10)</small>
*{{icon|DYK}} ... that the '''[[Metridium senile|frilled anemone]]''' may be eaten by the [[Aeolidia papillosa|shag rug nudibranch]]? <small>(2011-09-13)</small>
*{{icon|DYK}} ... that fully developed larvae of the '''[[Acanthastrea lordhowensis|starry cup coral]]''' ''(pictured)'' may be able to survive in the ocean for around 78 days before settling? <small>(2013-03-21)</small>
*{{icon|DYK}} ... that '''''[[Microphallus]]''''' is a [[genus]] of [[parasitic]] [[trematode]], some species of which are notable for the manipulation of the behaviour and growth of their hosts? <small>(2005-05-25)</small>
*{{icon|DYK}} ... that the flatworm '''''[[Microplana terrestris]]''''' can use a trail of mucus as a "suspension bridge" to pass from one leaf to another? <small>(2018-10-26)</small>
*{{icon|DYK}} ... that if the '''[[Millepora alcicornis|sea ginger]]''' coral ''(pictured)'' detects a [[gorgonian|sea fan]] growing nearby, it will send out "attack" branches to eventually smother it? <small>(2012-01-11)</small>
*{{icon|DYK}} ... that '''[[Millepora complanata|blade fire coral]]''' is one of the first coral species to recolonise damaged reefs? <small>(2015-07-26)</small>
*{{icon|DYK}} ... that '''[[mobbing behavior]]''' is seen in species as diverse as the [[Great Tit]] ''(pictured)'' and [[California Ground Squirrel]]? <small>(2007-06-16)</small>
*{{icon|DYK}} ... that the tunicate '''''[[Molgula citrina]]''''' may have travelled to Alaska in a [[sea chest]] via the [[Northwest Passage]]? <small>(2015-01-26)</small>
*{{icon|DYK}} ... that the [[tadpole]] [[larva]] of the sea grape '''''[[Molgula oculata]]''''' can swim but the larva of '''''[[Molgula occulta]]''''' has no tail and cannot? <small>(2013-06-12)</small>
*{{icon|DYK}} ... that people may be fined US$250,000 for importing '''[[monkey meat]]''' into the [[United States]]? <small>(2017-08-03)</small>
*{{icon|DYK}} ... that zoologist '''[[Thomas Harrison Montgomery, Jr.]]''' was the first to propose that [[chromosome]]s play a dominant role in [[Sex-determination system|determining an organism's sex]]? <small>(2015-07-21)</small>
*{{icon|DYK}} ... that '''''[[Motobdella montezuma]]''''' is the only [[leech]] to hunt in open water? <small>(2010-04-22)</small>
*{{icon|DYK}} ... that in 2007, the tiny [[hydrozoa]]n jellyfish '''''[[Muggiaea atlantica]]''''' killed 100,000 [[Aquaculture of salmonids|farmed salmon]] in Norway? <small>(2015-04-23)</small>
*{{icon|DYK}} ... that all sea lions in [[Otago]] descend from '''[[Mum (sea lion)|Mum]]'''? <small>(2024-05-15)</small>
*{{icon|DYK}} ... that the '''[[Mussa angulosa|spiny flower coral]]''' attacks other [[Scleractinia|corals]] that try to grow too close to it? <small>(2012-10-25)</small>
*{{icon|DYK}} ... that the '''[[Mycale adhaerens|purple scallop sponge]]''' has a [[Mutualism (biology)|mutualistic relationship]] with the mollusc on which it lives? <small>(2017-11-30)</small>
*{{icon|DYK}} ... that the '''[[Mycale laevis|orange icing sponge]]''' often grows on the underside of the '''[[Porites astreoides|mustard hill coral]]'''? <small>(2013-05-09)</small>
*{{icon|DYK}} ... that [[rhinoceroses]] are '''[[Myopia in animals|nearsighted]]''' but have superior senses of hearing and smell? <small>(2012-12-01)</small>
*{{icon|DYK}} ... that different stages of the fish [[parasite]] '''''[[Myxobolus cerebralis]]''''' were originally thought to be three different organisms in two different [[class (biology)|classes]]? <small>(2005-05-09)</small>
*{{icon|DYK}} ... that a group of [[Late Permian]] mammal relatives called '''[[Nanictidopidae]]''' ''(restoration pictured)'' may have [[frugivore|eaten fruit]] because their small teeth were unsuitable for grinding most plant material? <small>(2012-01-13)</small>
*{{icon|DYK}} ... that the marine worm '''''[[Neanthes arenaceodentata]]''''' is both an environmental monitor and a caring father? <small>(2020-12-21)</small>
*{{icon|DYK}} ... that the crab '''''[[Lauridromia intermedia]]''''' usually wears a [[sponge]] but one individual was found sporting a '''[[Nemanthus annamensis|gorgonian wrapper]]''' ''(pictured)''? <small>(2014-02-09)</small>
*{{icon|DYK}} ... that the [[starfish]] '''''[[Nepanthia belcheri]]''''' can [[Fragmentation (reproduction)|split itself in half]] and grow new arms on each section? <small>(2013-06-24)</small>
*{{icon|DYK}} ... that the peanut worm '''''[[Nephasoma minutum]]''''' has been referred to as a "taxonomic wastebasket"? <small>(2018-07-30)</small>
*{{icon|DYK}} ... that in the [[trematode|fluke]] '''''[[Notocotylus fosteri]]''''', the genital pore is located above the oral sucker? <small>(2010-05-01)</small>
*{{icon|DYK}} ... that the deepwater crinoid '''''[[Notocrinus virilis]]''''' broods its young in pouches on its arms? <small>(2019-05-16)</small>
*{{icon|DYK}} ... that the deepsea starfish '''''[[Novodinia antillensis]]''''' has large eyespots on the tips of its arms, but these may be non-functional? <small>(2018-03-10)</small>
*{{icon|DYK}} ... that the [[hydrozoan]] '''''[[Obelia longissima]]''''' sometimes disperses by [[raft]]ing? <small>(2013-01-05)</small>
*{{icon|DYK}} ... that the burrow of the spoon worm '''''[[Ochetostoma erythrogrammon]]''''' may be shared by flatworms, scale worms, molluscs, pea crabs, snapping shrimps, and copepods? <small>(2019-03-11)</small>
*{{icon|DYK}} ... that when threatened, the [[megascolecid]] worm '''''[[Octochaetus multiporus]]''''' [[bioluminescence|squirts a luminescent fluid]] from its mouth? <small>(2016-05-16)</small>
*{{icon|DYK}} ... that the discovery of 189 [[fossil]]s of the mid-[[Cambrian]] '''''[[Odontogriphus]]''''' thrust it into the centre of a heated debate about the [[evolution]] of [[mollusc]]s, [[annelid]]s and [[brachiopod]]s? <small>(2008-08-23)</small>
*{{icon|DYK}} ... that shortly after the full moon and precisely 55 minutes after sunset, the female '''[[Odontosyllis enopla|Bermuda fireworm]]''' rises to the sea surface and produces a [[Bioluminescence|bioluminescent]] display? <small>(2016-01-14)</small>
*{{icon|DYK}} ... that the fireworm '''''[[Odontosyllis phosphorea]]''''' lives unobtrusively on the seabed but rises to the surface and produces a [[Bioluminescence|sparkling]] display when it breeds? <small>(2016-01-15)</small>
*{{icon|DYK}} ... that the [[tunicate]] '''''[[Oikopleura cophocerca]]''''' lives in a disposable house on [[plankton]] [[broth]]? <small>(2013-04-13)</small>
*{{icon|DYK}} ... that there are many more male than female '''[[Ophiactis savignyi|little brittle stars]]''', probably because the males [[Fragmentation (reproduction)|fragment]] more frequently? <small>(2015-07-24)</small>
*{{icon|DYK}} ... that in June&nbsp;2022, a neurosurgeon found '''[[Ophidascaris robertsi|a roundworm]]''' in someone's brain? <small>(2023-10-22)</small>
*{{icon|DYK}} ... that the '''[[Ophidiaster granifer|grained seastar]]''' is the only known [[starfish]] that reproduces by [[parthenogenesis]]? <small>(2013-02-09)</small>
*{{icon|DYK}} ... that despite being [[Symmetry_in_biology#Radial_symmetry|radially symmetric]], the brittle star '''''[[Ophiocoma echinata]]''''' has a leading arm when moving? <small>(2015-04-12)</small>
*{{icon|DYK}} ... that the '''[[Ophiocomina nigra|black brittle star]]''' ''(pictured)'' and its associate the [[Ophiothrix fragilis|common brittle star]] may form beds on the sea floor extending hundreds of square metres and consisting of millions of individuals? <small>(2011-09-07)</small>
*{{icon|DYK}} ... that unlike most other [[brittle star]]s, the '''[[Ophionereis reticulata|reticulated brittle star]]''' ''(pictured)'' makes use of its [[tube feet]] during locomotion? <small>(2013-02-16)</small>
*{{icon|DYK}} ... that the '''[[Ophiopholis aculeata|crevice brittle star]]''' is sometimes involved in mass spawning events? <small>(2017-11-03)</small>
*{{icon|DYK}} ... that juvenile '''[[Ophiothrix angulata|angular brittle stars]]''' can re-enter a [[plankton]] phase, allowing them to relocate to a more suitable location? <small>(2017-08-27)</small>
*{{icon|DYK}} ... that the '''[[Ophiothrix fragilis|common brittle star]]''' ''(pictured)'' is a [[filter feeder]] and raises an arm to catch food particles floating by? <small>(2011-06-26)</small>
*{{icon|DYK}} ... that in the [[Baltic Sea]], the [[brittle star]] '''''[[Ophiura albida]]''''' ''(pictured)'' is the favourite food of the [[starfish]] ''[[Luidia sarsi]]''? <small>(2012-12-13)</small>
*{{icon|DYK}} ... that when the '''[[Ophiura ophiura|serpent star]]''' ''(pictured)'' is discarded with unwanted [[invertebrate]]s from fishing nets, it rarely survives? <small>(2011-08-15)</small>
*{{icon|DYK}} ... that about 6 million people are infected with '''''[[Opisthorchis viverrini]]''''' in Thailand? <small>(2010-06-30)</small>
*{{icon|DYK}} ... that the '''[[Echinaster echinophorus|orange knobbly star]]''' produces dark [[Egg (biology)|eggs]] which [[Plankton|drift with the current]] and orange eggs which sink immediately to the [[seabed]]? <small>(2012-10-05)</small>
*{{icon|DYK}} ... that both '''[[Montastraea faveolata|mountainous star coral]]''' and '''[[Montastraea franksi|boulder star coral]]''' are susceptible to coral diseases and [[Coral bleaching|bleaching]]? <small>(2015-02-12)</small>
*{{icon|DYK}} ... that the '''[[Oreaster reticulatus|red cushion star]]''' turns part of its stomach inside out and engulfs [[sponge]]s, other [[invertebrate]]s and [[detritus]]? <small>(2012-09-19)</small>
*{{icon|DYK}} ... that the '''[[Solaster dawsoni|morning sun star]]'''{{`s}} ''(pictured)'' [[Predation|predatory]] attacks on other starfish are not always successful, as the '''[[Stylasterias|velcro star]]''' and the '''[[Orthasterias|rainbow star]]''' fight back and the '''[[Pteraster tesselatus|slime star]]''' emits repellent [[mucus]]? <small>(2012-09-29)</small>
*{{icon|DYK}} ... that the '''[[Oscarella carmela|slime sponge]]''' was observed growing in [[Monterey Bay Aquarium]] and other [[Marine aquarium|marine aquaria]] before it was discovered in the [[Wildness|wild]]? <small>(2013-05-13)</small>
*{{icon|DYK}} ... that the sponge '''''[[Oscarella lobularis]]''''' can multiply by forming drips and bubbles? <small>(2018-10-31)</small>
*{{icon|DYK}} ... that '''''[[Oscarella tuberculata]]''''' can reproduce by [[budding]] in a process unique among sponges? <small>(2021-11-19)</small>
*{{icon|DYK}} ... that it appears that larvae of '''''[[Osedax frankpressi]]''''' that settle on a whale carcase develop into female worms, while those that settle on the female worms become males? <small>(2017-12-02)</small>
*{{icon|DYK}} ... that the deep sea [[Polychaete|worm]] '''''[[Osedax japonicus]]''''' relies on the skeleton of a dead [[whale]] for sustenance? <small>(2014-03-02)</small>
*{{icon|DYK}} ... that the [[genome]] of the flatworm '''''[[Otomesostoma auditivum]]''''' is nearly six times larger than the [[human genome]]? <small>(2018-12-08)</small>
*{{icon|DYK}} ... that [[Cliona|sponges]], [[Polychaete|worms]], and [[Bivalvia|molluscs]] bore into the stony skeleton of the '''[[Oulophyllia crispa|intermediate valley coral]]'''? <small>(2015-07-04)</small>
*{{icon|DYK}} ... that to avoid {{nowrap|COVID-19}} rule breaches, officials had to discourage people from posting '''[[Owha|a leopard seal]]'''{{`s}} location online? <small>(2024-09-15)</small>
*{{icon|DYK}} ... that about 1,400 '''[[Ozobranchus branchiatus|leeches]]''' were found to be attached to a [[green sea turtle]] in the Persian Gulf? <small>(2018-05-26)</small>
*{{icon|DYK}} ... that parasitic worms of genus '''''[[Pachysentis]]''''' have hooks on their [[Proboscis|heads]] ''(example pictured)'' and attach themselves to the intestine of the host? <small>(2023-07-07)</small>
*{{icon|DYK}} ... that in '''''[[pacu jawi]]''''' ''(pictured)'', the traditional cattle race of [[Tanah Datar Regency|Tanah Datar]], Indonesia, the jockey holds the tails of two cattle while they sprint across a muddy [[Paddy field|rice field]]? <small>(2019-04-08)</small>
*{{icon|DYK}} ... that '''''[[Paleodictyon nodosum]]''''' made use of a new source of energy not dependent on the Sun? <small>(2011-12-15)</small>
*{{icon|DYK}} ... that with more than 20 species, marchflies ''(example pictured)'' are the most common insect of the '''[[Paleofauna of the Eocene Okanagan Highlands|Eocene Okanagan Highlands paleofauna]]'''? <small>(2023-01-10)</small>
*{{icon|DYK}} ... that an animal called the "'''[[Palythoa toxica|Seaweed of Death from Hana]]'''" has caused poisonings of [[fishkeeping|aquarium hobbyists]]? <small>(2017-09-07)</small>
*{{icon|DYK}} ... that the tiny [[nematode]]s '''''[[Panagrolaimus detritophagus]]''''' and '''''[[Plectus parvus]]''''' were revived after more than 30,000 years frozen in [[permafrost]]? <small>(2018-09-25)</small>
*{{icon|DYK}} ... that spines of the '''[[Paracentrotus lividus|purple sea urchin]]''' ''(pictured)'' provide shelter for [[large-headed Goby]] juveniles? <small>(2011-09-01)</small>
*{{icon|DYK}} ... that over 2,000 years ago two Chinese armies traveled {{Nowrap|10,000 km}} to find [[Ferghana horse|"Heavenly Horses"]], apparently infected with a '''[[Parafilaria multipapillosa|tiny worm]]''' causing them to "sweat blood" from sores"? <small>(2011-03-25)</small>
*{{icon|DYK}} ... that the sea cucumber '''''[[Leptopentacta elongata]]''''' has a U-shaped or S-shaped body and occupies a burrow in the seabed? <small>(2019-06-16)</small>
*{{icon|DYK}} ... that [[parasite|parasitic]] [[platyhelminthes|flat worm]]s of the genus '''''[[Paramphistomum]]''''', including its [[type species|type]] species '''''[[Paramphistomum cervi|P. cervi]]''''', are responsible for a serious disease called '''[[Amphistomiasis|paramphistomiasis]]''' in [[cattle]] and [[sheep]]? <small>(2013-03-22)</small>
*{{icon|DYK}} ... that the soft coral '''''[[Paramuricea clavata]]''''' ''(pictured)'' may live for over fifty years? <small>(2015-01-04)</small>
*{{icon|DYK}} ... that when dislodged from its burrow, the '''[[Paranthus rapiformis|onion anemone]]''' may get rolled around by the sea before finding a suitable place to dig? <small>(2017-07-27)</small>
*{{icon|DYK}} ... that the arrow worm '''''[[Parasagitta setosa]]''''' eats about 85% of its body weight each day? <small>(2015-04-20)</small>
*{{icon|DYK}} ... that female '''''[[Parascaris equorum]]''''' roundworms, an [[intestinal parasite]] of horses, can grow to be as long as {{convert|15|in|cm}}? <small>(2014-11-16)</small>
*{{icon|DYK}} ... that '''''[[Parasite Rex]]''''' discusses the various parasites that use humans as their host, such as the [[tsetse fly]]'s [[African trypanosomiasis|trypanosomes]] and [[filarial worms]]? <small>(2016-03-22)</small>
*{{icon|DYK}} ... that '''''[[Hemioniscus balani]]''''' is called a "'''[[parasitic castration|parasitic castrator]]'''" although its barnacle host remains a functioning male because the barnacle can no longer also function as a female? <small>(2011-02-19)</small>
*{{icon|DYK}} ... that the fish '''''[[Carapus acus]]''''' lives in association with a sea cucumber, such as '''''[[Parastichopus regalis]]''''', spending the day inside its host and emerging at night to feed? <small>(2021-04-29)</small>
*{{icon|DYK}} ... that the [[marine worm]], '''''[[Parborlasia corrugatus]]''''', fires an adhesive, barbed [[proboscis]] as a means of defense, and to capture prey? <small>(2010-12-19)</small>
*{{icon|DYK}} ... that the young of the tiny [[starfish]] '''''[[Parvulastra parvivipara]]''''' are [[Cannibalism|cannibals]]? <small>(2013-05-28)</small>
*{{icon|DYK}} ... that young '''''[[Parvulastra vivipara]]''''' live inside their mother and eat each other? <small>(2018-04-23)</small>
*{{icon|DYK}} ... that the '''[[bat star]]''' has five to nine arms which resemble the wings of a [[bat]]? <small>(2009-11-29)</small>
*{{icon|DYK}} ... that if the [[embryo]] of the '''[[Patiria pectinifera|blue bat star]]''' is split into its constituent [[Cell (biology)|cells]], they can recombine into a viable [[Bipinnaria|starfish larva]]? <small>(2013-07-10)</small>
*{{icon|DYK}} ... that one [[threatened species|threat]] to the [[Vulnerable species|vulnerable]] '''[[Pavona cactus|potato chip coral]]''' is its collection for the aquarium trade? <small>(2013-04-25)</small>
*{{icon|DYK}} ... that the coral '''''[[Pavona maldivensis]]''''' can emit a bright orange [[fluorescence]]? <small>(2017-09-18)</small>
*{{icon|DYK}} ... that the larger feeding tentacles of the '''[[Pawsonia saxicola|sea gherkin]]''' carry food to its mouth, where two smaller ones help push food in? <small>(2019-02-23)</small>
*{{icon|DYK}} ... that soon after being ingested by the [[Clytia gregaria|gregarious jellyfish]], the [[planula|larvae]] of the developing '''[[Peachia quinquecapitata|twelve-tentacled parasitic anemone]]''' will eat the jellyfish's gonads? <small>(2011-10-22)</small>
*{{icon|DYK}} ... that juvenile '''[[Pearsonothuria|Graeffe's sea cucumber]]s''' [[Mimicry|mimic]] the bright colouring of the sea slug, ''[[Phyllidia varicosa]]'', which is [[Toxicity|toxic]]? <small>(2012-02-18)</small>
*{{icon|DYK}} ... that the [[Test (biology)|shell]] of the [[Extinction|extinct]] [[sea urchin]] '''''[[Pelanechinus|Pelanechinus corallina]]''''' was composed of separate groups of fused plates which resulted in its being flexible? <small>(2012-12-30)</small>
*{{icon|DYK}} ... that the [[Colony (biology)|colonial]] hydroid '''''[[Pennaria disticha]]''''' has two types of tentacles? <small>(2016-03-31)</small>
*{{icon|DYK}} ... that the [[tunicate]] '''''[[Phallusia mammillata]]''''' accumulates [[vanadium]] in its blood cells? <small>(2016-05-19)</small>
*{{icon|DYK}} ... that [[nematode]] '''''[[Phasmarhabditis hermaphrodita]]''''' is used to kill [[Pest (organism)#Gastropods|slug pests]]? <small>(2010-12-11)</small>
*{{icon|DYK}} ... that young [[cusk-eel]]s hide between the spines of the [[sea urchin]] species '''''[[Phormosoma placenta]]''''' to find protection from predators? <small>(2013-01-06)</small><br>... that juvenile [[cusk-eel]]s are believed to seek protection from [[Predation|predators]] by hiding among the spines of the [[sea urchin]] '''''[[Phormosoma placenta]]'''''? <small>(2013-02-07)</small>
*{{icon|DYK}} ... that in May 2018, the 8,000th animal was photographed for '''''[[The Photo Ark]]''''' project, which aims to document all 12,000 species living in zoos and wildlife sanctuaries worldwide? <small>(2018-07-23)</small>
*{{icon|DYK}} ... that the underwater [[glue]] secreted by the '''[[sandcastle worm]]''' ''(pictured)'' is being investigated for potential medical applications, including holding [[bone]] fragments together? <small>(2009-11-07)</small>
*{{icon|DYK}} ... that a square metre patch of '''[[Phylactolaemata]]''', a [[freshwater]] [[Class (biology) | class]] of [[Bryozoa]], can produce 800,000  statoblasts, "survival pods" withstanding freezing and drying that get carried long distances? <small>(2009-08-12)</small>
*{{icon|DYK}} ... that the '''[[Phyllodiscus|night anemone]]''' is adept at [[camouflage]] and [[mimicry]]? <small>(2014-01-29)</small>
*{{icon|DYK}} ... that the worm '''''[[Phyllodoce lineata]]''''' is a predator and scavenger, feeding mostly on other [[polychaete]]s? <small>(2020-03-03)</small>
*{{icon|DYK}} ... that '''''[[Phyllodoce mucosa]]''''' can form "roads" as they crawl across the beach towards carcasses? <small>(2017-09-12)</small>
*{{icon|DYK}} ... that '''''[[Phymanthus crucifer]]''''' ''(pictured)'' has bright red suckers on its column, to which [[debris]] can attach for [[camouflage]]? <small>(2010-06-17)</small>
*{{icon|DYK}} ... that the [[Paleozoic]] [[monoplacophora]]n '''''[[Pilina unguis]]''''' was twice as large as any known living monoplacophoran? <small>(2009-08-27)</small>
*{{icon|DYK}} ... that '''[[pillar coral]]''' is susceptible to both [[Coral bleaching|bleaching]] and [[Aurantimonadaceae|white plague]] disease? <small>(2012-12-03)</small>
*{{icon|DYK}} ... that the gut of '''''[[Piscicola geometra]]''''' harbours [[Symbiosis|symbiotic]] bacteria which help the leech to digest fish blood? <small>(2018-07-13)</small>
*{{icon|DYK}} ... that the [[predatory]] land flatworm '''''[[Platydemus manokwari]]''''' is a serious threat to rare [[endemic]] land [[snail]]s in the [[Pacific Islands]]? <small>(2009-11-02)</small>
*{{icon|DYK}} ... that when specimens of '''''[[Platygyra contorta]]''''' coral were studied in 1977, they were identified as examples of ''[[Platygyra daedalea|P. rustica]]''? <small>(2015-12-06)</small>
*{{icon|DYK}} ... that the [[Spawn (biology)|spawning]] period of the coral '''''[[Platygyra lamellina]]''''' is regulated by the phases of the moon? <small>(2015-07-20)</small>
*{{icon|DYK}} ... that the sea gooseberry '''''[[Pleurobrachia pileus]]''''' has fishing tentacles up to twenty times its body length? <small>(2015-03-24)</small>
*{{icon|DYK}} ... that the '''[[Plexaura homomalla|black sea rod]]''' coral contains large quantities of a lipid, [[Prostaglandin|prostaglandin A]], which deters [[Predation|predatory]] fish from feeding on it by making them vomit? <small>(2012-04-18)</small>
*{{icon|DYK}} ... that the '''[[Plexaurella nutans|giant slit-pore sea rod]]''' can grow to more than a metre (yard) tall? <small>(2012-12-28)</small>
*{{icon|DYK}} ... that the '''[[Oxynaspis gracilis|black coral barnacle]]''' sometimes grows on '''''[[Plumapathes pennacea]]'''''? <small>(2017-07-27)</small>
*{{icon|DYK}} ... that the corals '''''[[Pocillopora verrucosa]]''''' ''(pictured)'' and '''''[[Pocillopora damicornis]]''''' can reproduce by [[Fragmentation (reproduction)|fragmentation]], by releasing their [[gamete]]s into the sea or by [[Egg_incubation#Incubation_by_invertebrates|brooding]] their eggs? <small>(2014-01-13)</small>
*{{icon|DYK}} ... that the coral '''''[[Pocillopora elegans]]''''' is considered "[[Vulnerable species|vulnerable]]" after being severely depleted in the eastern Pacific during the 1982–1983 [[El Niño–Southern Oscillation|El Niño event]]? <small>(2017-10-24)</small>
*{{icon|DYK}} ... that the [[polychaete]] worm '''''[[Poecilochaetus serpens]]''''' digs a burrow with its head and lines it with particles of clay or mud cemented with mucus? <small>(2019-04-07)</small>
*{{icon|DYK}} ... that the tunicate '''''[[Polycarpa fibrosa]]''''' lives buried in sand or gravel with just its siphons protruding? <small>(2015-01-25)</small>
*{{icon|DYK}} ... that the coral '''''[[Polycyathus muellerae]]''''' is part of an assemblage of organisms that grow in caves? <small>(2016-02-09)</small>
*{{icon|DYK}} ... that a marine organism described in 1971 as a new species of [[gastrotrich]] was later identified as the larva of a bristleworm, probably '''''[[Polydora ciliata]]'''''? <small>(2017-08-24)</small>
*{{icon|DYK}} ... that the worm '''''[[Polydora glycymerica]]''''' bores into the shell of bivalve molluscs, mainly '''''[[Glycymeris yessoensis]]''''', and lives inside it? <small>(2018-12-10)</small>
*{{icon|DYK}} ... that although the two sponges look similar, sediment rarely settles on the surface of '''''[[Polymastia boletiformis]]''''' ''(example pictured)'', whereas '''''[[Polymastia penicillus]]''''' often appears dirty? <small>(2021-06-10)</small>
*{{icon|DYK}} ... that the flatworm '''''[[Polystoma integerrimum]]''''', a frog parasite, has a [[Biological life cycle|life cycle]] which synchronises with that of its host? <small>(2018-05-20)</small>
*{{icon|DYK}} ... that with a stretched length of up to {{cvt|20|cm|in|0}}, '''''[[Pontobdella muricata]]''''' is one of the largest marine leeches? <small>(2020-01-28)</small>
*{{icon|DYK}} ... that colonies of '''[[Porites lobata|lobe coral]]''' ''(pictured)'' are sometimes broken into fragments by the feeding activity of [[stone triggerfish]]? <small>(2011-12-28)</small>
*{{icon|DYK}} ... that "microatolls" of the coral '''''[[Porites lutea]]''''' have been used to study past changes in sea level? <small>(2020-10-15)</small>
*{{icon|DYK}} ... that the sea urchin '''''[[Pourtalesia miranda]]''''' and the [[Venus flytrap sea anemone]] dominate the seabed community at a depth of {{convert|2000|m|ft|-2|abbr=on}} off the coast of West Africa? <small>(2021-07-30)</small>
*{{icon|DYK}} ... that [[Priapulida|penis worms]] very similar to '''''[[Priapulus caudatus]]''''' created [[trace fossil]]s in the early [[Cambrian|Cambrian period]]? <small>(2018-08-20)</small>
*{{icon|DYK}} ... that the flatworm '''''[[Procerodes littoralis]]''''' is tolerant of wide fluctuations in salinity, being able to survive both in freshwater and in seawater? <small>(2018-08-11)</small>
*{{icon|DYK}} ... that '''''[[Prolecithophora|Plagiostomum vittatum]]''''', the "[[candy cane|Candy Cane]] [[Worm]]", is a [[flatworm]] with red [[stripe]]s? <small>(2007-01-04)</small>
*{{icon|DYK}} ... that '''''[[Promachocrinus]]''''' is unusual among [[crinoid]]s in having ten pairs of arms? <small>(2019-04-08)</small>
*{{icon|DYK}} ... that the '''[[Prostheceraeus vittatus|candy striped flatworm]]''' ''(pictured)'' appears to glide across the seabed, being moved by [[Cilium|cilia]] on its underside? <small>(2018-08-17)</small>
*{{icon|DYK}} ... that various studies show '''[[Prostitution among animals|prostitution exists among animals]]''' such as [[Adélie Penguin]]s ''(pictured)'', [[chimpanzee]]s, and [[crab-eating macaque]]s? <small>(2012-04-03)</small>
*{{icon|DYK}} ... that '''''[[Prostoma jenningsi]]''''', a [[ribbon worm]] found in a recreational fishing pond in [[Lancashire]], England, is the county's only [[endemism|endemic]] species? <small>(2011-12-03)</small>
*{{icon|DYK}} ... that the flatworm '''''[[Pseudobiceros bedfordi]]''''' uses its two penises to engage in [[penis fencing]] ''(pictured)''? <small>(2011-02-05)</small>
*{{icon|DYK}} ... that a species in the genus of sponges '''''[[Pseudoceratina]]''''' produces a chemical that can help prevent migration of [[metastatic breast cancer]] cells? <small>(2022-04-21)</small>
*{{icon|DYK}} ... that the fossilized remains of the '''[[Diploria clivosa|knobby brain coral]]''' and the '''[[Diploria strigosa|symmetrical brain coral]]''' have been found in Puerto Rico dating back to the [[Pleistocene]]? <small>(2012-09-20)</small>
*{{icon|DYK}} ... that [[metabolite]]s isolated from the '''[[Pseudoplexaura porosa|porous sea rod]]''' show [[Cytotoxicity|cytotoxic]] activity against human tumour cells? <small>(2015-03-27)</small>
*{{icon|DYK}} ... that the '''[[Psolus chitonoides|slipper sea cucumber]]''' is avoided by most predatory fish, crabs, and gastropod molluscs, but is preyed on by starfish, especially the [[leather star]]? <small>(2017-11-13)</small>
*{{icon|DYK}} ... that the '''[[Pteraster militaris|wrinkled star]]''' [[Egg incubation|broods]] some of its eggs in a brood chamber? <small>(2013-05-29)</small>
*{{icon|DYK}} ... that the '''[[Ptilosarcus gurneyi|orange sea pen]]''' can't write? <small>(2015-05-12)</small>
*{{icon|DYK}} ... that the '''[[Purple poppy|purple remembrance poppy]]''' was created to commemorate animals that served during wartime, but is not endorsed by [[The Royal British Legion]] which sells the official red [[remembrance poppy]] ''(pictured)''? <small>(2018-11-11)</small>
*{{icon|DYK}} ... that [[zooid|members]] of the [[colony (biology)|colonial]] [[tunicate]] '''''[[Pyrosoma atlanticum]]''''' may [[bioluminescence|glow]] in response to each other? <small>(2011-11-26)</small>
*{{icon|DYK}} ... that almost all [[tunicate]]s of the species '''''[[Pyura pachydermatina]]''''' house at least one [[Parasite|parasitic]] [[Gononemertes australiensis|ribbon worm]]? <small>(2013-04-27)</small>
*{{icon|DYK}} ... that the lakes of '''[[Thirlmere Lakes National Park]]''' contain a bright green freshwater sponge ('''''[[Radiospongilla sceptroides]]''''') but no freshwater snails? <small>(2011-06-03)</small>
*{{icon|DYK}} ... that [[beetle]]s act as an intermediate host to complete the life cycle of the worm '''''[[Raillietina cesticillus]]''''', a parasite that infests the intestines of chickens? <small>(2013-03-13)</small>
*{{icon|DYK}} ... that [[ant]]s act as an intermediate host to complete the life cycle of the worm '''''[[Raillietina tetragona]]''''', a parasite that infests in the intestines of birds such as chicken and pigeons? <small>(2013-03-09)</small>
*{{icon|DYK}} ... that the '''[[Ramisyllis multicaudata|branching worm living inside a sponge]]''' is unlikely to be able to sustain itself solely through what it eats? <small>(2017-09-16)</small>
*{{icon|DYK}} ... that the recently described [[synapsid]] '''''[[Raranimus]]''''' ''(pictured)'' is the most [[basal (phylogenetics)|basal]] member of the [[Order (biology)|order]] [[Therapsida]], from which [[mammal]]s are a descendant taxon? <small>(2009-09-30)</small>
*{{icon|DYK}} ... that [[black lemur]]s use toxic [[millipede]] secretions as insect repellent, and apparently '''[[Recreational drug use in animals|enjoy their narcotic effect]]'''? <small>(2023-04-15)</small>
*{{icon|DYK}} ... that '''''[[Relicanthus daphneae]]''''', originally thought to be one of the [[sea anemone]]s, is so distinct from them that it belongs in a new [[Order (biology)|order]] of its own? <small>(2014-05-18)</small>
*{{icon|DYK}} ... that you can '''[[remote control animal|remotely control animals]]''' by inserting wires into their brains? <small>(2013-11-16)</small>
*{{icon|DYK}} ... that '''[[Rewilding Argentina]]''' has reintroduced [[Giant otter|giant river otters]], [[giant anteater]]s, and jaguars to the country? <small>(2024-04-06)</small>
*{{icon|DYK}} ... that infection with the [[Parasitism|parasitic]] [[nematode]] '''''[[Rhabdias bufonis]]''''' can cause host [[frog]]s to die? <small>(2012-09-03)</small>
*{{icon|DYK}} ... that '''''[[Rhodactis howesii]]''''', a [[sea anemone]]-like [[Corallimorpharia |corallimorph]], is eaten by the [[Samoans]] but can prove fatal if consumed raw? <small>(2011-04-12)</small>
*{{icon|DYK}} ... that the jellyfish '''''[[Rhopilema esculentum]]''''' can be eaten raw as a salad and has a crisp texture? <small>(2015-07-07)</small>
*{{icon|DYK}} ... that the appearance of the [[nudibranch]] '''''[[Marionia levis]]''''' closely resembles the surface of the soft coral '''''[[Rhytisma fulvum]]''''' on which it feeds? <small>(2015-05-28)</small>
*{{icon|DYK}} ... that '''''[[Rotylenchulus reniformis]]''''', a [[roundworm]] found in [[tropical]] and [[subtropical]] areas throughout the world, is a major [[parasite]] of [[crop (agriculture)|crop plant]]s? <small>(2007-05-18)</small>
*{{icon|DYK}} ... that the '''[[Sabella spallanzanii|European fan worm]]''' has [[invasive species|invaded]] Australia? <small>(2014-03-27)</small>
*{{icon|DYK}} ... that the featherduster worm '''''[[Sabellastarte spectabilis]]''''' sometimes grows in crevices in [[Pocillopora meandrina|cauliflower coral]] from which a crown of branched tentacles form a plume? <small>(2011-06-26)</small>
*{{icon|DYK}} ... that the acorn worm '''''[[Saccoglossus bromophenolosus]]''''' is named after a chemical found in its tissues? <small>(2017-09-25)</small>
*{{icon|DYK}} ... that at the base of each tentacle of the sea anemone '''''[[Sagartia troglodytes]]''''', there is a distinctive black mark shaped like a capital letter "<span style="font-family:Times New Roman;">B</span>"? <small>(2011-09-11)</small>
*{{icon|DYK}} ... that [[fossil]]ised [[crinoid]] columnals from [[Lindisfarne]] which were strung together as a [[necklace]] or [[rosary]] became known as '''[[St Cuthbert's beads]]'''? <small>(2007-09-18)</small>
*{{icon|DYK}} ... that the tube worm '''''[[Salmacina dysteri]]''''' grows on harbour installations, on the hulls of ships and at depths of {{convert|600|m|ft|-2|abbr=on}}? <small>(2016-04-03)</small>
*{{icon|DYK}} ... that the jellyfish '''''[[Sanderia malayensis]]''''' has a life cycle that includes a number of different types of [[asexual reproduction]]? <small>(2019-01-29)</small>
*{{icon|DYK}} ... that '''[[Savalia savaglia|gold coral]]''' has one of the longest lifespans of any organism on Earth? <small>(2015-06-11)</small>
*{{icon|DYK}} ... that '''[[Savika|people in Madagascar wrestle bulls]]''' to commemorate the [[Famadihana|unearthing of ancestral corpses]]? <small>(2024-04-04)</small>
*{{icon|DYK}} ... that an [[anomalocaridid]], a bizarre [[Cambrian]] organism, '''[[Schinderhannes bartelsi|has been found]]''' 100&nbsp;million years later, in the [[Devonian]] era? <small>(2009-02-14)</small>
*{{icon|DYK}} ... that the freshwater snail '''''[[Indoplanorbis exustus]]''''' ''(pictured)'' transfers veterinarily important parasites, including the [[Trematoda|fluke]] '''''[[Schistosoma spindale]]'''''? <small>(2010-08-06)</small>
*{{icon|DYK}} ... that the '''[[Pagurus dalli|whiteknee hermit crab]]''' is benefitted by the presence of the '''[[Schuchertinia milleri|hedgehog hydroid]]''' but harmed by the barnacle '''''[[Clistosaccus]]'''''? <small>(2019-05-24)</small>
*{{icon|DYK}} ... that the '''[[Sclerodactyla briareus|hairy sea cucumber]]''' can eject its internal organs to confuse and deter [[Predation|predators]]? <small>(2012-02-16)</small>
*{{icon|DYK}} ... that the '''[[Scolymia lacera|fleshy disk coral]]''' is small but aggressive and attacks neighbouring [[coral]]s? <small>(2012-10-28)</small>
*{{icon|DYK}} ... that the southernmost worm species, '''''[[Scottnema lindsayae]]''''', reproduces best at temperatures below {{convert|10|C|F}}? <small>(2022-10-13)</small>
*{{icon|DYK}} ... that although most '''[[sea anemone]]s''' ''(example pictured)'' are harmless to humans, a few are venomous and some can be lethal? <small>(2017-10-14)</small>
*{{icon|DYK}} ... that the '''[[sea pineapple]]''' (''pictured''), an edible [[sea squirt]], has been described as "something that could exist only in a purely [[hallucination|hallucinatory]] [[eco-system]]" and its taste as "[[rubber]] dipped in [[ammonia]]"? <small>(2007-06-20)</small>
*{{icon|DYK}} ... that '''[[sea urchin]]s''' can [[bald sea urchin disease|go bald]]? <small>(2018-06-19)</small>
*{{icon|DYK}} ... that the '''[[Seriatopora hystrix|thin birdsnest coral]]''' can reproduce by "polyp bail-out"? <small>(2015-05-10)</small>
*{{icon|DYK}} ... that the blood of '''''[[Serpula]]''''' tubeworms ''(pictured)'' appears green when deoxygenated, though it is light red when oxygenated? <small>(2010-05-04)</small>
*{{icon|DYK}} ... that larvae of the '''[[Serpula columbiana|red tube worm]]''' do not settle on [[Nereocystis|bull kelp]], probably because that seaweed inflates its float chambers with [[carbon monoxide]]? <small>(2019-02-25)</small>
*{{icon|DYK}} ... that reefs formed by the developing '''[[Serpula vermicularis|plume worm]]''' ''(pictured)'' are sometimes broken apart by the activity of the [[Cliona celata|red boring sponge]]? <small>(2011-11-19)</small>
*{{icon|DYK}} ... that animal behavior scientist '''[[Chris Sherwin]]''' wrote that insects can experience "negative mental states"? <small>(2017-11-10)</small>
*{{icon|DYK}} ... that '''[[Siderastrea siderea|massive starlet coral]]''' forms large mounds whereas '''[[Siderastrea radians|lesser starlet coral]]''' can form [[coral]] pebbles that roll around? <small>(2012-07-19)</small>
*{{icon|DYK}} ... that the '''[[skeleton panda sea squirt]]''' was known on the Internet for its skeleton-like appearance years before its formal description? <small>(2024-03-25)</small>
*{{icon|DYK}} ... that the [[nematode]] '''''[[Skrjabinoclava kinsellai]]''''' is characterized by the presence of shoe-like and nipple-like structures? <small>(2010-04-09)</small>
*{{icon|DYK}} ... that some animals interrupt their [[hibernation]] a couple of times during [[winter]] so that they can '''[[Sleep (non-human)|sleep]]'''? <small>(2008-01-06)</small>
*{{icon|DYK}} ... that the [[larva]] of the '''[[Solaster endeca|purple sunstar]]''' ''(adult pictured)'' attaches itself to the [[seabed]] with a sucker before [[metamorphosis|changing]] into a juvenile [[starfish]]? <small>(2012-10-31)</small>
*{{icon|DYK}} ... that the '''[[Solaster paxillatus|orange sun star]]''' ''(pictured)'' can be found on the seabed in waters anywhere from {{convert|11|to|3740|m}} deep? <small>(2012-10-20)</small>
*{{icon|DYK}} ... that the coral '''''[[Solenosmilia variabilis]]''''' dominates reefs {{convert|1000|m|ft|-2}} beneath the sea? <small>(2015-07-10)</small>
*{{icon|DYK}} ... that the '''[[soybean cyst nematode]]''' is a significant pest affecting [[soybean]] production on three continents? <small>(2005-09-02)</small>
*{{icon|DYK}} ... that the tiny bivalve mollusc '''''[[Montacuta substriata]]''''' attaches to the spines of the '''[[Spatangus purpureus|purple heart urchin]]''', where it resembles a grain of sand? <small>(2021-10-15)</small>
*{{icon|DYK}} ... that ''Zoologia physica'', a scientific handbook about animals by '''[[Johann Sperling]]''' from the [[University of Wittenberg#History|University of Wittenberg]], was published in 1661 after his death? <small>(2017-02-23)</small>
*{{icon|DYK}} ... that the [[gonad]]s of the sea anemone '''''[[Sphaerechinus granularis]]''''' ''(pictured)'' are considered a delicacy in Italian cuisine? <small>(2011-09-07)</small>
*{{icon|DYK}} ... that sites in [[Florida Bay]] with an abundance of '''[[Spheciospongia vesparium|loggerhead sponges]]''' experience few [[algal bloom|blooms]] of [[cyanobacteria]]? <small>(2018-11-27)</small>
*{{icon|DYK}} ... that former [[NASCAR]] driver St.&nbsp;James Davis '''[[St. James Davis chimpanzee attack|was badly mauled by two chimpanzees]]''' while visiting one who was the best man at his wedding? <small>(2023-02-19)</small>
*{{icon|DYK}} ... that in the '''[[starlet sea anemone]]''', [[gene]]s involved in the formation of the column base are identical to those responsible for the development of the head in [[vertebrate]]s? <small>(2014-01-23)</small>
*{{icon|DYK}} ... that a '''[[Steinernema scapterisci|nematode]]''' kills the [[mole cricket]]s it parasitises by infecting them with a specialist bacterium? <small>(2015-05-20)</small>
*{{icon|DYK}} ... that the '''[[Sterechinus neumayeri|Antarctic sea urchin]]''' eats [[Microphyte|microscopic algae]] and small invertebrates, and feasts on [[Pinniped|seal]] [[Feces|faeces]] when available? <small>(2012-01-19)</small>
*{{icon|DYK}} ... that '''''[[Sternaspis scutata]]''''' swallows mud? <small>(2019-04-10)</small>
*{{icon|DYK}} ... that "starfish soup" made from '''''[[Stichaster striatus]]''''' is said to have been fed to workers in South America to discourage alcohol consumption? <small>(2018-06-26)</small>
*{{icon|DYK}} ... that historically, '''[[Stichopus herrmanni|curryfish]]''' ''(example pictured)'' was not commercially harvested because it disintegrated too easily when handled? <small>(2018-12-23)</small>
*{{icon|DYK}} ... that [[potato]] [[tuber]]s grow at the end of '''[[stolon]]s'''? <small>(2007-05-12)</small>
*{{icon|DYK}} ... that '''[[Stolonica socialis|orange sea grapes]]''' contain substances that have a [[Cytotoxicity|cytotoxic]] effect? <small>(2022-01-03)</small>
*{{icon|DYK}} ... that the age of a '''[[Strongylocentrotus droebachiensis|Green Sea Urchin]]''' ''(pictured)'' is generally calculable based on its size since it grows {{convert|10|mm|abbr=on|1}} every year? <small>(2008-05-27)</small>
*{{icon|DYK}} ... that the blue, turquoise and green colors of [[peacock]] tail feathers (''pictured'') result from '''[[structural coloration]]'''? <small>(2012-05-15)</small>
*{{icon|DYK}} ... that despite the coral '''''[[Stylophora pistillata]]''''' being a common species with a wide distribution, and '''''[[Stylophora madagascarensis]]''''' being common around the coast of Madagascar, the [[International Union for Conservation of Nature |IUCN]] has assessed one as "[[Near-threatened species|near threatened]]" and the other as "[[Endangered species|endangered]]"? <small>(2018-11-10)</small>
*{{icon|DYK}} ... that '''[[Suleiman the elephant]]''', named after the [[Ottoman]] [[Sultan]] [[Suleiman the Magnificent]], became the first [[elephant]] to visit [[Vienna]] in March 1552? <small>(2006-08-03)</small>
*{{icon|DYK}} ... that one of the first researchers to propose '''[[swimming with dolphins|dolphin-assisted therapy]]''' for humans later renounced it? <small>(2022-11-18)</small>
*{{icon|DYK}} ... that when breeding, the polychaete worm '''''[[Syllis prolifera]]''''' produces a detachable "[[stolon]]" which joins other stolons to swarm in the [[water column]]? <small>(2017-10-29)</small>
*{{icon|DYK}} ... that the [[Hexactinellid|sponge-dwelling]] branched worm '''''[[Syllis ramosa]]''''' has a single mouth and many [[anus]]es? <small>(2017-08-22)</small>
*{{icon|DYK}} ... that the '''[[Synapta maculata|snake sea cucumber]]''' will break itself into bits to escape from a predator? <small>(2017-09-23)</small>
*{{icon|DYK}} ... that the [[sea cucumber]] '''''[[Synaptula lamperti]]''''' feeds on [[detritus]] from the [[Ianthella basta|elephant ear sponge]]? <small>(2011-08-03)</small>
*{{icon|DYK}} ... that the '''[[Synaptula recta|gut-like sea cucumber]]''' moves by [[peristalsis]] because it has no [[tube feet]]? <small>(2018-12-03)</small>
*{{icon|DYK}} ... that when the solitary octocoral '''''[[Taiaroidae|Taiaroa tauhou]]''''' was discovered in 1973, it was at first thought to be a [[sea anemone]]? <small>(2015-02-10)</small>
*{{icon|DYK}} ... that stings from '''''[[Tamoya ohboya]]''''', named for the exclamation "oh boy", cause severe pain and skin damage? <small>(2013-01-28)</small>
*{{icon|DYK}} ... that sheep infected with the parasitic nematode '''''[[Teladorsagia circumcincta]]''''' may suffer from protein deficiency? <small>(2019-08-12)</small>
*{{icon|DYK}} ... that '''''[[Terpios hoshinota]]''''', a sponge that overgrows and kills corals, has spread extensively since being detected in Guam in 1973? <small>(2020-10-30)</small>
*{{icon|DYK}} ... that '''''[[Tetragonoporus|Tetragonoporus calyptocephalus]]''''', a tapeworm that parasitizes whales, can grow to almost {{convert|40|m|ft|-1|abbr=on}} in length and produce billions of eggs during its lifetime? <small>(2018-06-04)</small>
*{{icon|DYK}} ... that the '''[[Teuthidodrilus|squidworm]]''' is a newly discovered [[genus]] of [[Bathyal zone|deep water]] [[polychaete|worms]] with physical characteristics of both [[benthos|seabed-dwelling]] and [[Pelagic fish|free-swimming]] worms? <small>(2010-12-08)</small>
*{{icon|DYK}} ... that '''[[The Most Dangerous Animal in the World]]''' ''(pictured)'' was an exhibit at the [[Bronx Zoo]] in 1963? <small>(2022-05-31)</small>
*{{icon|DYK}} ... that the peanut worm '''''[[Themiste cymodoceae]]''''' can survive without oxygen for several days? <small>(2019-03-16)</small>
*{{icon|DYK}} ... that the peanut worm '''''[[Themiste hennahi]]''''' is a "tentacle breather"? <small>(2019-03-25)</small>
*{{icon|DYK}} ... that the marine worm '''''[[Themiste pyroides]]''''' is unusual in that it forms [[Swarm behaviour|swarms]] when breeding? <small>(2019-06-19)</small>
*{{icon|DYK}} ... that the leech '''''[[Theromyzon tessulatum]]''''' is a parasite of waterfowl, invading their mouths, noses, and respiratory passages? <small>(2018-07-14)</small>
*{{icon|DYK}} ... that larvae of the '''[[thimble jellyfish]]''' are the most common cause of [[seabather's eruption]] in the Caribbean and the Gulf of Mexico? <small>(2018-05-30)</small>
*{{icon|DYK}} ... that the starfish '''''[[Thromidia catalai]]''''' ''(pictured)'' can weigh as much as 6 kilograms (13&nbsp;lb)? <small>(2021-12-01)</small>
*{{icon|DYK}} ... that all that can be seen of '''''[[Thyone roscovita]]''''' is often a plume of branching tentacles? <small>(2020-10-05)</small>
*{{icon|DYK}} ... that remains of the recently described saber-toothed [[anomodont]] '''''[[Tiarajudens]]''''' were uncovered from a location in [[Brazil]] that was first found using [[Google Earth]]? <small>(2011-03-30)</small>
*{{icon|DYK}} ... that the [[chiton]] '''''[[Tonicella marmorea]]''''' was first described from Greenland by the Danish naturalist [[Otto Fabricius]], who spent five years as a missionary in the country? <small>(2020-09-28)</small>
*{{icon|DYK}} ... that the '''[[flower urchin]]''' ''(pictured)'' was named the "most dangerous [[sea urchin]]" in the 2014 ''[[Guinness World Records]]''? <small>(2014-12-09)</small>
*{{icon|DYK}} ... that the '''[[Trachelobdella lubrica|black swan leech]]''' attaches itself to the skin or eye of a fish before working its way to the gill chamber? <small>(2021-01-27)</small>
*{{icon|DYK}} ... that the spider genus '''''[[Seycellesa]]''''' and the [[nematode]] genus '''''[[Traklosia]]''''' were both originally named ''Robertia'', but had to be renamed? <small>(2018-03-16)</small>
*{{icon|DYK}} ... that a {{convert|400|lb|adj=on}} tapir was '''[[Transportation of animals|transported]]''' by [[FedEx]] from Florida to Los Angeles? <small>(2013-08-08)</small>
*{{icon|DYK}} ... that '''[[traumatic insemination]]''' ''(pictured)'' is a practice in [[invertebrate]]s where the male pierces the female's [[abdomen]] with his penis and injects his [[sperm]] into the wound? <small>(2009-04-09)</small>
*{{icon|DYK}} ... that the [[boxer crab]]s '''''[[Lybia tessellata]]''''' and '''''[[Lybia edmondsoni]]''''' carry a [[sea anemone]] such as '''''[[Triactis producta]]''''' in each claw for protection from [[Predation|predators]]? <small>(2012-03-07)</small>
*{{icon|DYK}} ... that in [[Europe]], the human consumption of pork, wild boar, and horse meat are the main sources of infection from the [[parasite]] '''''[[Trichinella britovi]]'''''? <small>(2009-12-13)</small>
*{{icon|DYK}} ... that the [[box jellyfish]] '''''[[Tripedalia cystophora]]''''' feeds on the [[copepod]] '''''[[Dioithona oculata]]''''' which swarms in sunlit patches of water among [[mangrove]] roots? <small>(2014-04-30)</small>
*{{icon|DYK}} ... that despite being unaffected by [[rabies]] or [[pseudorabies]], the sea urchin '''''[[Tripneustes depressus]]''''' contains antivirals to these diseases? <small>(2018-07-26)</small>
*{{icon|DYK}} ... that the '''[[collector urchin]]''' is so named because of its tendency to collect debris on its [[Anatomical terms of location|dorsal side]]? <small>(2010-03-09)</small>
*{{icon|DYK}} ... that the '''[[Tripneustes ventricosus|West Indian sea egg]]''' ''(pictured)'' decorates itself with bits of [[seagrass]] and fragments of [[Bivalve shell|shell]] held on by its [[tube feet]]? <small>(2012-11-03)</small>
*{{icon|DYK}} ... that the starfish '''''[[Trophodiscus almus]]''''' is unusual in brooding its young on its upper surface? <small>(2014-03-25)</small>
*{{icon|DYK}} ... that '''''[[Tubulanus superbus]]''''' and '''''[[Tubulanus annulatus]]''''' are both known as "football jersey worms"? <small>(2017-09-24)</small>
*{{icon|DYK}} ... that the red colour of the ribbon worm '''''[[Tubulanus polymorphus]]''''' may warn predators that it is toxic or unpalatable? <small>(2017-09-14)</small>
*{{icon|DYK}} ... that the [[freshwater]] '''[[turbellaria]]n''' ''Microstomum caudatum'' can swallow prey about as large as itself? <small>(2008-12-31)</small>
*{{icon|DYK}} ... that '''''[[Turbinaria peltata]]''''', '''''[[Turbinaria reniformis]]''''', '''''[[Turbinaria mesenterina]]''''' and '''''[[Turbinaria stellulata]]''''' are all species of '''[[Turbinaria (coral)|disc coral]]''' that the [[IUCN]] considers "vulnerable"? <small>(2015-05-19)</small>
*{{icon|DYK}} ... that '''[[tusk shell]]s''' are a [[class (biology)|class]] of marine [[mollusk]]s that resemble [[elephant]]s' [[tusk]]s, and were used by the [[Native American|native]]s of the [[Pacific Northwest]] as [[wampum]]? <small>(2005-02-05)</small>
*{{icon|DYK}} ... that '''[[Twelves]]''', a [[pet monkey]], died and [[Synthetic diamond|became a diamond]]? <small>(2023-04-01)</small>
*{{icon|DYK}} ... that a new species of [[leech]] was named '''''[[Tyrannobdella rex]]''''' because of its disproportionally large teeth? <small>(2010-04-21)</small>
*{{icon|DYK}} ... that the '''[[Urechis caupo|innkeeper worm]]''' catches its food with a net and then swallows the net? <small>(2019-02-27)</small>
*{{icon|DYK}} ... that, in 19th and 20th century [[Romania]], [[Roma minority in Romania|Roma people]] known as '''[[Ursari]]''' trained [[brown bear]]s to step on people's backs, as a [[Home remedy|folk remedy]] for [[back pain]]? <small>(2007-06-27)</small>
*{{icon|DYK}} ... that young [[painted greenling]]s rest among the tentacles of the '''[[Urticina lofotensis|strawberry anemone]]''' ''(pictured)'' and there find protection from predators? <small>(2011-11-15)</small>
*{{icon|DYK}} ... that the diet of the sea anemone '''''[[Urticinopsis antarctica]]''''' includes sea urchins, starfish, sea cucumbers, brittle stars, crinoids, gastropods, bivalve molluscs, and small fish? <small>(2017-02-24)</small>
*{{icon|DYK}} ... that the '''[[Venus flytrap sea anemone]]''' ''(pictured)'' has been found in large numbers near decaying [[Pyrosoma atlanticum|gelatinous carcases]] on the [[seabed]]? <small>(2013-01-07)</small>
*{{icon|DYK}} ... that '''[[VetUK]]''', which has annual revenues of more than £10 million as of 2010, initially operated out of the living room of co-founder Iain Booth? <small>(2014-06-29)</small>
*{{icon|DYK}} ... that the bryozoan '''''[[Walkeria tuberosa]]''''' is sometimes referred to as ''Valkeria tuberosa'' despite being named after the Scottish natural historian [[John Walker (natural historian)|John Walker]]? <small>(2021-12-08)</small>
*{{icon|DYK}} ... that the colonial bryozoan '''''[[Walkeria uva]]''''' is sometimes only detectable by accident? <small>(2021-12-12)</small>
*{{icon|DYK}} ... that the '''[[Watersipora subtorquata|red-rust bryozoan]]'''{{'s}} tolerance of copper may enable other [[Biofouling|fouling organisms]] to grow on the hulls of ships? <small>(2016-03-30)</small>
*{{icon|DYK}} ... that in 1253 Henry III of England ordered that '''[[White bear of Henry III|his white bear]]''' ''(sculpture pictured)'' be permitted to swim and hunt in the River Thames? <small>(2024-09-08)</small>
*{{icon|DYK}} ... that [[Endemism|endemics]] among the '''[[wildlife of Morocco]]''' include more than six hundred species of vascular plants and a single species of bird ''(pictured)''? <small>(2017-01-18)</small>
*{{icon|DYK}} ... that the '''[[wildlife of Nigeria]]''' includes 940 species of bird and all eight known species of West African [[mangrove]]? <small>(2019-07-05)</small>
*{{icon|DYK}} ... that the '''[[wildlife of Senegal]]''' includes a critically endangered subspecies of the [[giant eland]] and the common '''[[Senegal one-striped grass mouse]]'''? <small>(2019-06-30)</small>
*{{icon|DYK}} ... that the '''[[wildlife of Sudan]]''' includes leopards, giraffes, crocodiles, water hyacinth and the [[Vachellia tortilis|umbrella thorn acacia]]? <small>(2023-03-16)</small>
*{{icon|DYK}} ... that [[Christmas Island red crab|the red crabs]] ''(example pictured)'' dominating the '''[[wildlife of Christmas Island]]''' have been threatened by the arrival of [[yellow crazy ant]]s? <small>(2020-01-15)</small>
*{{icon|DYK}} ... that the '''[[wildlife of Malaysia]]''' is some of the most diverse in the world, existing in forests believed to be {{Nowrap|130 million}} years old? <small>(2010-12-24)</small>
*{{icon|DYK}} ... that in the '''[[wildlife of Nepal]]''', [[Rhododendron]] is the most widely found national flower of the country and its red flower, known locally as Lal Guran, forms the wreath round the national symbol? <small>(2013-06-08)</small>
*{{icon|DYK}} ... that the '''[[wildlife of Russia]]''' includes about four million [[reindeer]] in the [[tundra]] region which can endure temperatures down to about {{convert|−50|°C}}? <small>(2016-01-20)</small>
*{{icon|DYK}} ... that in 2007, '''[[Wildlife in the Bronx|José the beaver]]''' set up housekeeping in the Bronx? <small>(2022-06-26)</small>
*{{icon|DYK}} ... that the '''[[wildlife of the Falkland Islands]]''' includes no native terrestrial [[reptile]]s, [[amphibian]]s, or even [[tree]]s, and that the only native terrestrial mammal, the [[Falkland Islands Wolf|warrah]] ''(pictured)'', became extinct in the mid-19th century? <small>(2011-04-05)</small>
*{{icon|DYK}} ... that [[Winston Churchill]] was often portrayed as a bulldog ''(pictured)'', but '''[[Winston Churchill's pets|his personal pet dog]]''' during the Second World War was a poodle? <small>(2023-08-24)</small>
*{{icon|DYK}} ... that '''[[Wojtek (soldier bear)|the bear ''Wojtek'']]''' was an officially [[enlisted]] [[soldier]] of the [[Polish II Corps]] and a participant in the [[Battle of Monte Cassino]]? <small>(2007-06-07)</small>
*{{icon|DYK}} ... that [[Alfred Russel Wallace|Wallace]] wrote about, and [[Edward Bagnall Poulton|Poulton]] published '''[[James Wood-Mason]]'''{{`s}} [[flower mantis]] drawing ''(pictured)''? <small>(2013-01-10)</small>
*{{icon|DYK}} ... that the marine '''[[Xenoturbella bocki|paradox worm]]''' may resemble the common ancestor of humans and mollusks? <small>(2018-02-21)</small>
*{{icon|DYK}} ... that the accidental discovery of [[sea daisy]] species '''''[[Xyloplax medusiformis]]''''' in the [[Pacific Ocean|Pacific]] inspired the search that found '''''[[Xyloplax turnerae|X.&nbsp;turnerae]]''''' in the [[Atlantic Ocean|Atlantic]]? <small>(2013-02-11)</small>
*{{icon|DYK}} ... that the orange flatworm '''''[[Yungia aurantiaca]]''''' can regrow its whole body from a small fragment of tissue? <small>(2021-06-02)</small>
*{{icon|DYK}} ... that '''[[zoomusicology]]''' studies sounds, vocalizations and the organization of the noisy communications of [[animal]]s? <small>(2004-10-07)</small>
Total pages in content type is 771
=={{icon|FP}} Featured pictures==
<gallery mode=packed>
File:Actiniaria.jpg|Actiniaria
File:Actinoscyphia aurelia 1.jpg|Actinoscyphia aurelia 1
File:Alitta succinea (epitoke).jpg|Alitta succinea (epitoke)
File:Amphiprion perideraion (Pink anemonefish) in Heteractis magnifica (Magnificent sea anemone).jpg|Amphiprion perideraion (Pink anemonefish) in Heteractis magnifica (Magnificent sea anemone)
File:Annelid redone w white background.svg|Annelid redone w white background
File:Anémona de mar (Heteractis crispa), parque nacional Ras Muhammad, Egipto, 2022-03-29, DD 43.jpg|Anémona de mar (Heteractis crispa), parque nacional Ras Muhammad, Egipto, 2022-03-29, DD 43
File:Anémona de mar común (Anemonia viridis), Parque natural de la Arrábida, Portugal, 2020-07-21, DD 07.jpg|Anémona de mar común (Anemonia viridis), Parque natural de la Arrábida, Portugal, 2020-07-21, DD 07
File:Anémona incrustante amarilla (Parazoanthus axinellae), Parque natural de la Arrábida, Portugal, 2022-07-20, DD 49.jpg|Anémona incrustante amarilla (Parazoanthus axinellae), Parque natural de la Arrábida, Portugal, 2022-07-20, DD 49
File:Aplysina archeri (Stove-pipe Sponge-pink variation).jpg|Aplysina archeri (Stove-pipe Sponge-pink variation)
File:Archimollusc-en.svg|Archimollusc-en
File:Asterias rubens, dissection.svg|Asterias rubens, dissection
File:Carpilius convexus is consuming Heterocentrotus trigonarius in Hawaii.jpg|Carpilius convexus is consuming Heterocentrotus trigonarius in Hawaii
File:Colonial anemone zebra.jpg|Colonial anemone zebra
File:Colpophyllia natans (Boulder Brain Coral) entire colony.jpg|Colpophyllia natans (Boulder Brain Coral) entire colony
File:Condylactis gigantea (Giant Anemone - yellow & pink tip variation).jpg|Condylactis gigantea (Giant Anemone - yellow & pink tip variation)
File:Coral (Galaxea fascicularis), mar Rojo, Egipto, 2023-04-18, DD 128.jpg|Coral (Galaxea fascicularis), mar Rojo, Egipto, 2023-04-18, DD 128
File:Coral plato (Danafungia scruposa), mar Rojo, Egipto, 2023-04-15, DD 49.jpg|Coral plato (Danafungia scruposa), mar Rojo, Egipto, 2023-04-15, DD 49
File:Cross section Olindias formosa en.svg|Cross section Olindias formosa en
File:Crown of Thorns Starfish at Malapascuas Island.jpg|Crown of Thorns Starfish at Malapascuas Island
File:Dendrogramma enigmatica sp. nov., holotype.png|Dendrogramma enigmatica sp. nov., holotype
File:Entacmaea quadricolor (Bubble tip anemone).jpg|Entacmaea quadricolor (Bubble tip anemone)
File:Erizo de mar violáceo (Sphaerechinus granularis), Madeira, Portugal, 2019-05-31, DD 40.jpg|Erizo de mar violáceo (Sphaerechinus granularis), Madeira, Portugal, 2019-05-31, DD 40
File:Espirógrafo (Bispira volutacornis), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 43.jpg|Espirógrafo (Bispira volutacornis), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 43
File:Espirógrafo (Sabella spallanzanii), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 70.jpg|Espirógrafo (Sabella spallanzanii), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 70
File:Estrella roja del Mediterráneo (Echinaster sepositus), Parque natural de la Arrábida, Portugal, 2020-07-31, DD 79.jpg|Estrella roja del Mediterráneo (Echinaster sepositus), Parque natural de la Arrábida, Portugal, 2020-07-31, DD 79
File:Eucidaris tribuloides (Slate-pencil Urchin).jpg|Eucidaris tribuloides (Slate-pencil Urchin)
File:Gusano de fuego (Hermodice carunculata), Madeira, Portugal, 2019-05-31, DD 45.jpg|Gusano de fuego (Hermodice carunculata), Madeira, Portugal, 2019-05-31, DD 45
File:Haeckel Actiniae.jpg|Haeckel Actiniae
File:Lion's mane jellyfish in Gullmarn fjord at Sämstad 3.jpg|Lion's mane jellyfish in Gullmarn fjord at Sämstad 3
File:Lion's mane jellyfish in Gullmarn fjord at Sämstad 8 - edited.jpg|Lion's mane jellyfish in Gullmarn fjord at Sämstad 8 - edited
File:Marrus orthocanna crop.jpg|Marrus orthocanna crop
File:Moon jellyfish at Gota Sagher.JPG|Moon jellyfish at Gota Sagher
File:Nine-armed Sea Star (Luidia senegalensis) (4338628827).jpg|Nine-armed Sea Star (Luidia senegalensis) (4338628827)
File:Pelagia noctiluca (Sardinia).jpg|Pelagia noctiluca (Sardinia)
File:Pepino de mar (Holothuria fuscogilva), parque nacional Ras Muhammad, Egipto, 2022-03-28, DD 119.jpg|Pepino de mar (Holothuria fuscogilva), parque nacional Ras Muhammad, Egipto, 2022-03-28, DD 119
File:Pepino de mar (Thelenota ananas), mar Rojo, Egipto, 2023-04-17, DD 61.jpg|Pepino de mar (Thelenota ananas), mar Rojo, Egipto, 2023-04-17, DD 61
File:Periclimenes imperator (Emperor shrimp) on Bohadschia argus (Sea cucumber).jpg|Periclimenes imperator (Emperor shrimp) on Bohadschia argus (Sea cucumber)
File:Phyllorhiza punctata (White-spotted jellyfish) edit.jpg|Phyllorhiza punctata (White-spotted jellyfish) edit
File:Pyrosoma atlanticum (12256).jpg|Pyrosoma atlanticum (12256)
File:Tripedalia-cystophora.png|Tripedalia-cystophora
File:Tripneustes ventricosus (West Indian Sea Egg) edit.jpg|Tripneustes ventricosus (West Indian Sea Egg) edit
File:Tripneustes ventricosus (West Indian Sea Egg-top) and Echinometra viridis (Reef Urchin - bottom).jpg|Tripneustes ventricosus (West Indian Sea Egg-top) and Echinometra viridis (Reef Urchin - bottom)
File:Yellow papillae flatworm (Thysanozoon nigropapillosum) (cropped).jpg|Yellow papillae flatworm (Thysanozoon nigropapillosum) (cropped)
</gallery>

Total pages in content type is 43

=={{icon|GAN}} Good article nominees==
*{{icon|GAN}} [[:Deception in animals]]
Total pages in content type is 1
=={{icon|itn}} In the News articles==
*{{icon|itn}} [[:Simon Cowell (conservationist)]] <small>(2024-06-11)</small>
*{{icon|itn}} [[:Destruction of ivory]] <small>(2016-04-30)</small>
*{{icon|itn}} [[:Halicephalobus mephisto]] <small>(2011-06-03)</small>
*{{icon|itn}} [[:Hvaldimir]] <small>(2024-09-06)</small>
*{{icon|itn}} [[:Mali (elephant)]] <small>(2023-11-30)</small>
*{{icon|itn}} [[:Alan Rabinowitz]] <small>(2018-08-07)</small>
*{{icon|itn}} [[:Saturn (alligator)]] <small>(2020-05-24)</small>
Total pages in content type is 7
== Main page featured articles==
* [[:Apororhynchus]] <small>(2020-01-17)</small>
* [[:Australiformis]] <small>(2023-11-17)</small>
* [[:Bird]] <small>(2010-05-04)</small>
* [[:Cooperative pulling paradigm]] <small>(2018-07-26)</small>
* [[:Edward Drinker Cope]] <small>(2010-07-28)</small>
* [[:Fauna of Australia]] <small>(2005-12-27)</small>
* [[:Fauna of Puerto Rico]] <small>(2007-01-10)</small>
* [[:Gigantorhynchus]] <small>(2021-01-23)</small>
* [[:Icelandic Phallological Museum]] <small>(2013-03-16)</small>
* [[:Leech]] <small>(2020-10-21)</small>
* [[:Myxobolus cerebralis]] <small>(2005-06-20)</small>
* [[:Skunks as pets]] <small>(2005-01-09)</small>
* [[:Starfish]] <small>(2014-02-28)</small>
* [[:Viatkogorgon]] <small>(2022-04-09)</small>
Total pages in content type is 14
== Main page featured lists==
* [[:List of camouflage methods]] <small>(2013-05-27)</small>
Total pages in content type is 1
=={{icon|potd}} Picture of the day pictures==
<gallery mode=packed>
File:Actiniaria.jpg|Actiniaria <small>(2012-08-23)</small>
File:Actinoscyphia aurelia 1.jpg|Actinoscyphia aurelia 1 <small>(2013-03-12)</small>
File:Alitta succinea (epitoke).jpg|Alitta succinea (epitoke) <small>(2017-06-13)</small>
File:Amphiprion perideraion (Pink anemonefish) in Heteractis magnifica (Magnificent sea anemone).jpg|Amphiprion perideraion (Pink anemonefish) in Heteractis magnifica (Magnificent sea anemone) <small>(2022-05-20)</small>
File:Annelid redone w white background.svg|Annelid redone w white background <small>(2014-07-12)</small>
File:Anémona de mar (Heteractis crispa), parque nacional Ras Muhammad, Egipto, 2022-03-29, DD 43.jpg|Anémona de mar (Heteractis crispa), parque nacional Ras Muhammad, Egipto, 2022-03-29, DD 43 <small>(2023-02-10)</small>
File:Anémona de mar común (Anemonia viridis), Parque natural de la Arrábida, Portugal, 2020-07-21, DD 07.jpg|Anémona de mar común (Anemonia viridis), Parque natural de la Arrábida, Portugal, 2020-07-21, DD 07 <small>(2024-02-12)</small>
File:Aplysina archeri (Stove-pipe Sponge-pink variation).jpg|Aplysina archeri (Stove-pipe Sponge-pink variation) <small>(2016-01-31)</small>
File:Archimollusc-en.svg|Archimollusc-en <small>(2014-10-14)</small>
File:Asterias rubens, dissection.svg|Asterias rubens, dissection <small>(2013-12-15)</small>
File:Carpilius convexus is consuming Heterocentrotus trigonarius in Hawaii.jpg|Carpilius convexus is consuming Heterocentrotus trigonarius in Hawaii <small>(2011-10-25)</small>
File:Colonial anemone zebra.jpg|Colonial anemone zebra <small>(2014-05-26)</small>
File:Colpophyllia natans (Boulder Brain Coral) entire colony.jpg|Colpophyllia natans (Boulder Brain Coral) entire colony <small>(2012-09-02)</small>
File:Condylactis gigantea (Giant Anemone - yellow & pink tip variation).jpg|Condylactis gigantea (Giant Anemone - yellow & pink tip variation) <small>(2012-10-12)</small>
File:Coral plato (Danafungia scruposa), mar Rojo, Egipto, 2023-04-15, DD 49.jpg|Coral plato (Danafungia scruposa), mar Rojo, Egipto, 2023-04-15, DD 49 <small>(2024-08-28)</small>
File:Cross section Olindias formosa en.svg|Cross section Olindias formosa en <small>(2018-10-24)</small>
File:Crown of Thorns Starfish at Malapascuas Island.jpg|Crown of Thorns Starfish at Malapascuas Island <small>(2018-02-20)</small>
File:Dendrogramma enigmatica sp. nov., holotype.png|Dendrogramma enigmatica sp. nov., holotype <small>(2016-10-24)</small>
File:Entacmaea quadricolor (Bubble tip anemone).jpg|Entacmaea quadricolor (Bubble tip anemone) <small>(2014-04-29)</small>
File:Erizo de mar violáceo (Sphaerechinus granularis), Madeira, Portugal, 2019-05-31, DD 40.jpg|Erizo de mar violáceo (Sphaerechinus granularis), Madeira, Portugal, 2019-05-31, DD 40 <small>(2022-11-02)</small>
File:Espirógrafo (Bispira volutacornis), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 43.jpg|Espirógrafo (Bispira volutacornis), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 43 <small>(2024-07-17)</small>
File:Espirógrafo (Sabella spallanzanii), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 70.jpg|Espirógrafo (Sabella spallanzanii), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 70 <small>(2024-06-27)</small>
File:Estrella roja del Mediterráneo (Echinaster sepositus), Parque natural de la Arrábida, Portugal, 2020-07-31, DD 79.jpg|Estrella roja del Mediterráneo (Echinaster sepositus), Parque natural de la Arrábida, Portugal, 2020-07-31, DD 79 <small>(2024-02-18)</small>
File:Eucidaris tribuloides (Slate-pencil Urchin).jpg|Eucidaris tribuloides (Slate-pencil Urchin) <small>(2012-07-19)</small>
File:Gusano de fuego (Hermodice carunculata), Madeira, Portugal, 2019-05-31, DD 45.jpg|Gusano de fuego (Hermodice carunculata), Madeira, Portugal, 2019-05-31, DD 45 <small>(2023-04-12)</small>
File:Haeckel Actiniae.jpg|Haeckel Actiniae <small>(2006-05-27)</small>
File:Lion's mane jellyfish in Gullmarn fjord at Sämstad 3.jpg|Lion's mane jellyfish in Gullmarn fjord at Sämstad 3 <small>(2022-07-25)</small>
File:Lion's mane jellyfish in Gullmarn fjord at Sämstad 8 - edited.jpg|Lion's mane jellyfish in Gullmarn fjord at Sämstad 8 - edited <small>(2022-07-25)</small>
File:Marrus orthocanna crop.jpg|Marrus orthocanna crop <small>(2013-02-21)</small>
File:Moon jellyfish at Gota Sagher.JPG|Moon jellyfish at Gota Sagher <small>(2017-04-08)</small>
File:Nine-armed Sea Star (Luidia senegalensis) (4338628827).jpg|Nine-armed Sea Star (Luidia senegalensis) (4338628827) <small>(2018-05-14)</small>
File:Pelagia noctiluca (Sardinia).jpg|Pelagia noctiluca (Sardinia) <small>(2015-03-26)</small>
File:Pepino de mar (Holothuria fuscogilva), parque nacional Ras Muhammad, Egipto, 2022-03-28, DD 119.jpg|Pepino de mar (Holothuria fuscogilva), parque nacional Ras Muhammad, Egipto, 2022-03-28, DD 119 <small>(2024-09-20)</small>
File:Periclimenes imperator (Emperor shrimp) on Bohadschia argus (Sea cucumber).jpg|Periclimenes imperator (Emperor shrimp) on Bohadschia argus (Sea cucumber) <small>(2012-01-19)</small>
File:Phyllorhiza punctata (White-spotted jellyfish) edit.jpg|Phyllorhiza punctata (White-spotted jellyfish) edit <small>(2012-05-31)</small>
File:Pyrosoma atlanticum (12256).jpg|Pyrosoma atlanticum (12256) <small>(2021-06-17)</small>
File:Tripedalia-cystophora.png|Tripedalia-cystophora <small>(2016-10-20)</small>
File:Tripneustes ventricosus (West Indian Sea Egg) edit.jpg|Tripneustes ventricosus (West Indian Sea Egg) edit <small>(2012-07-07)</small>
File:Tripneustes ventricosus (West Indian Sea Egg-top) and Echinometra viridis (Reef Urchin - bottom).jpg|Tripneustes ventricosus (West Indian Sea Egg-top) and Echinometra viridis (Reef Urchin - bottom) <small>(2024-05-18)</small>
File:Yellow papillae flatworm (Thysanozoon nigropapillosum) (cropped).jpg|Yellow papillae flatworm (Thysanozoon nigropapillosum) (cropped) <small>(2020-04-09)</small>
</gallery>

Total pages in content type is 40
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