There are 23 different species of crocodiles; some of these are bigger than alligators and some are smaller. Both animals belong to the order known as crocodilia.
The exact size of a crocodile or alligator varies based on its species, but there are several defining characteristics that separate these two animals. Alligators generally have a rounded jaw, while crocodiles have a pointed jaw. These animals also live in different environments. Crocodiles possess special glands for ridding their bodies of excess salt, which is why they prefer saltwater areas. Alligators do not have this gland, and thus, make their home in freshwater.