What is the difference between crocodiles and alligators. Teeth. You can't see an alligator's teeth when it's mouth is closed; its lower teeth fit snugly into pits in the upper jaw. In contrast, a crocodile's lower teeth are always visible. . Color.
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Alligators and crocodiles are also slightly different colors. The typical crocodile tends to have a coloration that is an olive brown hue. Alligators usually have a darker, almost black appearance.
In terms of physical differences, observing the snout — the mouth and nose — is one of the simplest ways to distinguish between a crocodile and an alligator. Alligators have a broad snout, while crocodiles have a thinner snout.
In the wild, alligators tend to run away. While not exactly wallflowers, they certainly prefer their own company. Some species of crocodiles, on the other hand, have legendary tempers. The Salt Water Crocodile and the Nile Crocodile have been known to eat people.
Similar in appearance to other members of the same order, both caimans and gharials are long, semi-aquatic reptiles with extended snouts. Caimans are in the same family as alligators, but most species are much smaller — often around 6.5 to 8 feet (2 to 2.5 meters) long compared to 13 feet (4 meters) for American alligators. These reptiles are found in Central and South America. The gharial, found only in India, has a much narrower snout than other species in this order.