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Close-up photograph of a large red cuttlefish.
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Australian Giant Cuttlefish

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Hundreds of illustrated red crabs gathering on sand with Santa hats.
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Santa Claws is Coming to Town

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A hermit crab looks out from its coral dwelling in the waters of Japan's Ogasawara Islands.
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Coral Hermit Crab

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A photo of a solitary European green crab on a sandy substrate.
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European Green Crab (Carcinus maenas)

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A decomposing sea star loses its grip on a rock.
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A Starfish Wasting Away

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Video

Squid Loses Arm in Defense Strategy

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The staghorn coral is listed as Threatened under the U.S. Endangered Species Act. It is one of 22 coral species listed.
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Staghorn Coral

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A translucent, female hyperiid surrounded by white young in a barrel-shaped body cavity.
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Phronima Female and Young

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Even when a lobster is still a developing egg, you can see some of its adult features: an eye and legs.
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Lobster Egg

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Mantis shrimp have built-in polarized vision to help them see underwater—and maybe even communicate.
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Built-in Underwater Polarized Lenses?

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Seahorse couples (such as these Hippocampus histrix) greet each other every morning with a unique dance that sometimes involves changing color. The couple promenades and pirouettes together for several minutes before separating for the rest of the day. The
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Dancing Seahorse Pairs

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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
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Fossil Jellyfish

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