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Crocodylia
Temporal range: Upper CretaceousHolocene, 94–0 mya
Nile crocodile head.jpg
Nile crocodile (Crocodylus niloticus)
Pangil Crocodile Park Davao City.jpg
Saltwater crocodile (Crocodylus porosus)
Scientific classification e
Unrecognized taxon (fix):Crocodylia
Type species
Crocodylus niloticus
Laurenti, 1768
Genera

A crocodile is a large amphibious reptile. It lives mostly in large tropical rivers, where it is an ambush predator.

The Crocodylia is an order of mostly large, predatory, semiaquatic reptiles. Their ancestors, the clade Pseudosuchia, appeared about 250 million years ago in the early Triassic period.

Crocodiles as we know them first appeared 94 million years ago in the Upper Cretaceous period. They are the closest living relatives of birds: the two groups are the only survivors of the Archosauria.

One species, the Australian saltie, travels in coastal salt water as well as rivers. In very dry climates, crocodiles may aestivate and sleep out the dry season.

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