Alligator
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An alligator, or colloquially gator, is a large reptile in the genus Alligator of the family Alligatoridae of the order Crocodilia. The two extant species are the American alligator and the Chinese alligator. Additionally, several extinct species of alligator are known from fossil remains. Alligators first appeared during the late Eocene epoch about 37 million years ago.
An 1854 watercolor painting of an alligator from the Cayman Islands by Jacques Burkhardt.
Head
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"High walk" of an alligator
Alligatoridae
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The family Alligatoridae of crocodylians includes alligators, caimans and their extinct relatives.
Alligatoridae
A. olseni fore limb
Alligator prenasalis fossil
C. crocodilus at the Helsinki Tropicario Zoo aquarium in Helsinki, Finland in 2010