The main differences between Alligators and Crocodiles are the Snout Shape, the Teeth showing, and Habitat. Alligators have a wider, U-shaped snout, while crocodiles front ends are more of a V-shape. Crocodiles show their 4th tooth when they have their mouth closed (appearing to have a toothy grin) whereas Alligators cover their teeth. Crocodiles tend to live in saltwater locations, whereas Alligators prefer freshwater.