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What is the difference between a crocodile and an alligator?

The alligator is actually a subspecies of the crocodile, with a rounded snout (crocodile snouts are usually pointed) and a generally less aggressive attitude. It is part of the family Crocodylidae. You can also tell them apart by their teeth. Nearly all of the crocodile's teeth stay on the outside of the mouth when closed. The upper and lower teeth showing makes them look like they are smiling. The alligator, on the other hand, has a slight overbite--the bottom teeth fit inside the top.