Crabs have wide, flat bodies with no obvious tail. The head and chest are fused and protected by a shield-like structure called a carapace. The tail is tucked under its body. Males have a narrow tail; females have a broad, rounded one that supports their eggs. True crabs have a pair of claws followed by four pairs of walking legs. Various other crustaceans (hermit crabs, porcelain crabs and king crabs) superficially resemble crabs but have only three pairs of walking legs.

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