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Pink sea slug

This photograph shows a pink nudibranch in the genus Tritonia about 1,000 meters (3,280 feet) below the ocean surface, on Pioneer Seamount, off the coast of Central California. The 10-cm (4-inch) long nudibranch is eating the little pink polyps of a deep-sea bamboo coral, leaving behind a bare, white stalk. Nudibranchs are much too pretty to be called "sea slugs," but that's exactly what they are—marine snails without shells. The word nudibranch means "naked gill" in Latin. The gills on this nudibranch are the white, feathery tufts extending out from the animal's back.

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