A crocodile's jaws can apply 5,000 pounds of pressure per square inch. This means that they can bite through an arm or a leg with no problem. A human's jaw only produces 100 pounds of pressure per square inch. The crocodile jaw has very little opening strength, though. For example, a crocodile's mouth can be held shut with a rubber band.In addition to their strong jaws, crocodiles also have very keen hearing. It is so good, they can hear their babies calling from inside their egg. Crocodiles are very fast swimmers, which helps them catch their prey. They can swim up to 20 mph (32 kph) and can hold their breath underwater for around one hour. On land, crocodiles aren't nearly as fast. They can only run up to 11 mph (17.6 kph) for a short distance.
It is illegal to hunt crocodiles for their skin. This makes their skin very rare. A purse made from crocodile skin can cost more than $10,000.