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Boats docked in a Chesapeake Bay harbor
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Chesapeake Bay Harbor

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A Caribbean hermit crab (Coenobita clypeatus) crawls on the forest floor.
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The Great Hermit Crab Migration

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The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.
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Sea Stars, Urchins, and Relatives

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Image of deep-sea crustacean with black background.
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Vibilia

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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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Blue Dragon nudibranchs are very common to the southeast coast of Australia and have a few color variations. Juveniles are white with blue rhinophores, and adults vary from dark purple to lavender to golden brown.
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Serpent Pteraeolidia

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Orangutan crabs are covered in thin reddish hairs, and are frequently found living in bubble coral.
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Orangutan Crabs from Komodo Island

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A photo of a squid using bioluminescence to hide in the deep sea.
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Midwater Squid, Abralia veranyi

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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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Spiral-tufted bryozoan
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A Bryozoan's Medical Endosymbiont

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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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Squid expert Dr. Clyde Roper examines specimens stored in jars in the Smithsonian collection.
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Dr. Clyde Roper

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