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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
Photo

The Dancing Fiddler Crab Shows Off

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A polar bear and its cub in Arctic National Wildlife Refuge, Alaska.
Slideshow

Celebrating Marine Moms

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The siphonophores are an order of marine animals in the phylum Cnidaria (the same phylum containing jellyfish). 
Slideshow

Prints from Ernst Haeckel

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a close up of a spiny lobster
Photo

Caribbean Spiny Lobster

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A diagram of cephalopod suction
Photo

An Octopus' Tight Grip

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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
Slideshow

Bizarre and Beautiful Coral Reef Animals

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This rare staurozoan, or stalked jellyfish, Haliclystus californiensis, is about 2 centimeters in length and was collected off the coast of California.
Photo

Staurozoan: The Stalked Jellyfish

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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.
Overview

Sea Stars, Urchins, and Relatives

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This aptly named fish has two long fangs.
Slideshow

Creepy Critters: Marine Life Surfaces for Halloween

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A small, transparent, shell-less sea snail in the open ocean.
Article

Angels of the Sea

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a neon purple jellyfish
Article

Live Jellyfish Make Splash in Marine Education

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Many medicines were based on a chemical from the sea sponge Tectitethya crypta.
Article

Five Questions for Shirley Pomponi, Medical Sponge Hunter

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