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What is a crab? aka Claws

Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a single pair of 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 millimeters wide, to the Japanese spider crab, with a leg span of up to 13 ft. There are about 850 species of crab species that are found throughout the world's tropical and semi-tropical regions.

Crabs

Credits:

Robbins Underwater

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