Alligator and crocodile

There are 23 species in the crocodile family, including alligator caimans and gavial. All are large reptile with long bodies and short legs. Most alligator and caimans have wide U-shaped snout but crocodile have narrow v-shaped snout. The gavial has very long slender jaw- just right for catching fish. In alligator and caimans the teeth of the lower jaw fit into pit in the upper jaw and cannot be seen when the mouth is closed. In the crocodile the fourth tooth on each side of the lower jaw fit into notch in the upper jaw, so they are always visible. Crocodile are generally bigger and more aggressive than alligator