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A thresher shark uses its unusual tail fin for swimming and hunting.
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The Thrashing Thresher Shark

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The velvet crab's aggressive nature has earned it the nickname devil's crab.
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The Velvet Swimming Crab

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A bloom of moon jellies.
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A Bloom of Moon Jellies

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Tomopteris's bristles produce yellow bioluminescence, a unusual color among midwater animals, nearly all of which make some sort of light.
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Glow Worms

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Twin-spot snappers are curious top predators on Pacific coral reefs, eating a variety of fishes, shrimps, crabs, and snails among others, and are usually around 2.5 feet long.
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Curious Bohar

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Hagfish Slime Thread
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Spin Hagfish Slime into Silk

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This tentacle belongs to a blue button. While it has a central “float” with streaming tentacles like typical jellyfish, the blue button is a colony of many small hydroid animals.
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Blue Button Tentacle

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Haeckel discovered a species of rhizostome jellyfish in Bellagemma, Ceylon, in December 1881. Its form so impressed him that he used it as a model for ceiling decorations in his Villa Medusa home in Jena.
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Rhizostome Jellyfish

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Sand dollars (like those pictured in this set of illustrations) are flattened, burrowing sea urchins. Dead, sunlight-bleached specimens resemble silver coins, hence their common name. These figures portray a sand dollar’s lifecycle from larva to adult.
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Sea Urchins

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Colorful crustaceans from the Caribbean island of Guadeloupe.
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Colorful Caribbean Crustaceans

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Using dynamite to stun or kill bigger fish to sell at market leaves behind many dead undesired fish as bycatch.
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Fishing with Dynamite

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It's a pygmy seahorse (Hippocampus bargibanti), found in Indonesia's biodiverse Coral Triangle and one of the smallest seahorse species in the world! They can change colors like a chameleon to blend into their environment. This helps to protect them from p
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Can You Spot the Seahorse?

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