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Temporal range: Upper Cretaceous – Recent
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Crocodylomorpha
(unranked): Archosauria
Order: Crocodilia
Owen, 1842
Nile Crocodiles
Distribution of crocodiles

The Order Crocodilia is a group of Archosaur reptiles. There are three living families.

Crocodiles are the nearest living relatives to birds, because they are both survivors of the Archosaurs.

Crocodiles are first found in the Upper Cretaceous period. They are descendents of a much wider group of Archosaurs called the Crocodylomorphs. These, in the Upper Triassic, were slender land-living forms, the sister group of the dinosaurs.

The Crocodylomorphs, in turn, were part of an even larger group, the Crurotarsi, which are first seen early in the Triassic.