 Exoskeleton, an exoskeleton is the external skeleton that supports and protects an animal's body, in contrast to the internal skeleton and obskeleton of, for example, the human body. In usage, some of the larger kinds of exoskeletons are known as shells. Some animals with exoskeletons include insects such as grasshoppers and cockroaches and crustaceans such as crabs and lobsters. The shells of certain sponges and the various groups of shelled mollusks, including those of snails, clams, tusk shells, chitons and nautilus, are also exoskeletons. Some animals, such as the tortoise, have both an endoskeleton and an exoskeleton.