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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
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Zooxanthellae and Coral Bleaching

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A couple inches wide and up to ten feet long, the bobbit worm stays hidden under tropical sands with just its five antennae poking out—waiting for prey to swim by.
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The Bobbit Worm

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A bloom of moon jellies.
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A Bloom of Moon Jellies

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A side-view of translucent hyperiid with a black background.
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Cystisoma

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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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A deep-sea octopus protecting her eggs
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Vigilant Octomom

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A Pontoh pygmy seahorse
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How Many Seahorse Species?

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A sea butterfly, or sea snail, swims in the open ocean.
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A Swimming Snail

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A tan sea urchin from the deep seas of Curacao.
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Tan Sea Urchin

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Smithsonian Zoologist Dr. Clyde Roper in front of the museum's stored cephalopod collection.
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Smithsonian Cephalopod Collection

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
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Caught on Video: Giant Squid

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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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