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crab

crab

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crab Flattened, triangular, or oval ten-legged crustacean covered with a hard shell. Primarily marine, some crabs are found in freshwater and a few are terrestrial. Their short abdomen, often called a tail, is bent under. Most have a pair of large foreclaws, a pair of movable eyestalks and a segmented mouth. Crabs usually move sideways. Size: pea-sized to 3m (12ft). Order Decapoda.

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