Crabs are decapod crustaceans of the
infraorder Brachyura, which typically have a very short projecting
"tail" (abdomen) (Greek: βραχύς / brachys = short,[2] οὐρά / οura =
tail[3]), usually entirely hidden under the thorax. They live in all the
world's oceans, in fresh water, and on land, are generally covered with a thick
exoskeleton and have a single pair of claws. Many other animals with similar
names – such as hermit crabs, king crabs, porcelain crabs, horseshoe crabs and
crab lice – are not true crabs.
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