Beyond its ancient form, crocodiles are in fact complex reptiles. Unlike reptiles, crocodiles have four bear hearts, body cavities (diaphragm) and cerebral cortex. On the other hand, the outer morphology clearly shows the way aquatic predator lives. His "streamlined" body allows him to swim fast Crocodiles can move very quickly at short distances, even outside the water. This animal has a very strong jaw, which can bite with extraordinary strength, making it the animal with the greatest bite strength. Crocodile claws and nails are strong and sharp, but their necks are so stiff that crocodiles are not so easy to attack sideways or backwards.