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Male fiddler crabs, like this one collected on Moorea, wave their enlarged claw as way of signaling to other crabs, especially during mating season.
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Fiddler Crab

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Anemone shrimp in Puerto Galera, Philippines.
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Anemone Shrimp

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A photo of a sea walnut, a ctenophore.
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Sea Walnut (Mnemiopsis leidyi)

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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

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Dr. Clyde Roper (rear) and museum specialist Mike Sweeny examine a giant squid specimen.
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Studying 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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A tusk shell hermit crab peeks out of his shell.
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Tusk Shell Hermit Crab

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The blue lined octopus can be deadly, so it is best to stay away.
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The Dangerous Blue Octopus

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Oikopleura gorskyi is a rare deep-water species of larvacean
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Deep-Water Larvacean

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A blue-ringed octopus
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A Beautiful and Deadly Octopus

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The giant pacific octopus can grow up to 600 pounds!
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Revealing the Largest Octopus

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A blue-ringed octopus
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How Octopuses and Squids Change Color

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