Crabs are generally covered with a thick exoskeleton,
and armed with a single pair of chelae (claws).
Crabs are found in all of the world's oceans, while
many crabs live in fresh water and on land, particularly
in tropical regions. Crabs vary in size from the
pea crab, a few millimetres wide, to the Japanese
spider crab, with a leg span of up to 4 metres...
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