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What is a crab?

Updated: 11/7/2022
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10y ago

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Crabs are (usually) marine crustaceans. They have ten legs (counting specialized ones, e.g., claws or flattened pair of hind ones for swimming). Their body is generally broad and flattened; their eyes on short stalks, with the abdomen small and folded under the thorax. Commonly they have a hardened shell. The term crab is also used to describe other creatures with superficial similarities to true crabs, e.g., crustaceans like the hermit crab or horseshoe crab. There is also a parasite called a crab louse; body lice are informally referred to as crabs.

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10y ago
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9y ago

A crab is a a broad carapace-crustacean with 5 pairs of legs, stalked eyes, with the first pair acting as pincers.

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