crab FOODON:03411335 FOBI:0221 Crabs are decapod crustaceans of the infraorder *Brachyura*, which typically have a very short projecting "tail", 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. Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, 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. [https://en.wikipedia.org/wiki/Crab] crustacean