The male fiddler crab has one claw much larger than the other. It is used to attract females and defend territory. Fiddler crabs can't swim. Blue crabs, also known as the Chesapeake Bay crab, live in the Atlantic ocean. When winter comes, the blue crab settles onto the ocean's bottom and stops eating and growing.
Blue crabs are good swimmers with the last pair of legs modified into paddles at the end.
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