Crocodiles and alligators
Crocodiles (left) and alligators (right) are both reptiles from the order Crocodylia. You can tell the difference by looking at their heads. Crocodiles have a longer head shaped like a "V." Alligator heads are shorter and shaped like a "U." Also, when an alligator closes its mouth, most of its teeth are hidden. When a crocodile closes its mouth, many of the teeth protrude outside along the jawline. Crocodiles are generally lighter in color and are more aggressive than alligators.