♦ Crabs actually have ten appendages (legs). Therefore, they are known as decapods (deca = ten, poda = leg). Out of these, the first pair of appendages are modified into claws, which are known as chelae.
♦ Crabs are crustaceans. Crustaceans are creatures that do not have an endoskeleton like most animals, but they have an exoskeleton. The exoskeleton of the crab is like a shield on its body, known as a carapace.