The Nile crocodile is among the largest and best known biologically of all the crocodilians. Nile crocodiles are widely distributed throughout sub-saharan Africa, and historical records indicate its range extended into southern Israel and Jordan. The Nile crocodile is a large, lizard-shaped reptile with four short legs and a long muscular tail. The hide is rough and scaled. Juvenile Nile crocodiles are dark olive to brown with darker crossbands on tail and body.
Adults are uniformly dark with darker crossbands on tail.
The gavials is a carnivore because it eats only meat of other animals. Some of the animals are fishes, aquatic birds, small mammals, and fishes of the family of cyprinidae. Observations on the Gavial t opened its eyes. It closed its eyes then rolled them in the back of its head. Its skin on top of its head fell as if it was a raw piece of meat.