A prominent skeletal structure outside the body is seen in
Crab
The hard covering on the outer surface of an organism's body is called the exoskeleton. An exoskeleton is usually in the form of a shell. Crab is an example of an organism with an exoskeleton. Crocodile also has an exoskeleton in the form of tough leathery skin. In cow, goat, cat, fish the skeleton is present inside the body and this is called endoskeleton.