The alligator is a typical reptile. It is cold blooded- it gets its body heat from its surroundings. It lays eggs with shells, and though it cannot chew, it has a very efficient digestive system. Its brain is highly developed, and its heart has four chambers, though some reptiles have only three. Its lungs are also well developed, unlike the lungs of snakes, which are quite primitive. It differs from the crocodile in that its snout is broader and u shaped, and when its mouth is closed, you cannot see any of its teeth. On the other hand, a crocodile’s teeth are visible even when its mouth is shut.