Difference between Crocodiles and Alligators

Crocodiles and Alligators are both carnivorous semi-aquatic reptiles. Alligators are only found in North America, China, and Mexico. Crocodiles, on the other hand, have a large geographical range, though their habitat only includes warm regions. Let’s find out the difference between Crocodiles and Alligators.

Difference between Crocodiles and Alligators

Snout shape

The first major difference is the snout shape. Crocodiles have a V-shaped snout. Alligators have a more rounded, wider, U-shaped snout. Some crocodiles like the Mugger crocodiles and the Saltwater crocodiles have a relatively wider snout than other crocodiles but not as wide as Alligators.

Biological Classification

Species belonging to the genus Alligator are called Alligators. Crocodiles are species belonging to the family Crocodylidae.

A diagram showing Crocodile and alligator biological classification


Alligators are only found in freshwater while some crocodiles like the Saltwater crocodiles live in brackish water as well.

Biting force

Crocodile species generally have a greater biting force than Alligators. Saltwater crocodiles, the largest among all crocodiles have a biting force of over 3,500 psi. American Alligators, the largest alligators have a biting force of around 3,000 psi.

Temperature tolerance

Alligators can tolerate relatively colder temperatures than crocodiles. Crocodile species cannot tolerate colder temperatures for long. In the US during winters when the temperature reaches close to freezing, Alligators enter Brumation. During Brumation, Alligators slow down their metabolism and become very slow. This is their way of coping with the harsh winters.


In most alligators, only the upper teeth are visible when the mouth is closed. In crocodiles, both the upper and lower teeth are visible when the mouth is closed.

Conservation status

The American Alligator currently needs no human help. The Chinese Alligators however are critically endangered with only a few hundred individuals remaining in the wild.

Talking about the crocodile species,

  • The Australian freshwater crocodiles, the saltwater crocodiles, the New Guinea crocodile, the Mexican crocodile, and the Nile Crocodiles currently are not considered endangered.
  • The Mugger crocodile, the American crocodile, and the African dwarf crocodiles are marked vulnerable by the International Union for Conservation of Nature (IUCN).
  • The Orinoco crocodile of South America is critically endangered.
  • The West African slender-snouted crocodile, the Cuban crocodile, the Philippine crocodile, and the Siamese crocodile are also critically endangered.

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