differences between crocodiles and alligators
1 Snout shape: Alligators have wider, U-shaped snouts, while crocodile front ends are more pointed and V-shaped. 2  Toothy grin: When their snouts are shut, crocodiles look like they're flashing a toothy grin, as the fourth tooth on each side of the lower jaw sticks up over the upper lip.
Crocodilians are found mainly in lowlands in the tropics, but alligators also live in the southeastern United States and the Yangtze River in China. Florida, in the United States, is the only place that crocodiles and alligators live side by side.