how many legs do crabs walk on
Crabs are in the subphylum Crustacea. They are decapods (having eight walking legs and two grasping claws), along with lobsters, crayfish and shrimps. Crabs form an order within the decapods, called the Brachyura. Their short body is covered by a thick exoskeleton. They are an extremely successful group, found all over the world.