Many people want to know what the difference is between alligators and crocodiles. There are many differences, most of which are not easy to see. One of the differences that you can see is the shape of the head.
Alligators have a broader, more rounded snout while crocodiles have a narrower, more pointed snout.
If you look at the side of a crocodile's mouth , you'll notice the fourth tooth on the bottom jaw sticks outside of the top jaw and into a groove. The upper and lower teeth of a crocodile stick outside the jaws while the bottom teeth of the alligator fit into sockets in the upper jaw. Alligators outnumber crocodiles 1,000 to 1 in the wild in North America. The American crocodile is considered endangered, with a wild population of less than 500. The American alligator population is estimated at about 1.5 million.