Temporal range: Upper Cretaceous – Recent
|American crocodile (Crocodylus acutus)|
Crocodilians are the nearest living relatives to birds, because they are both survivors of the Archosaurs.
Crocodilians 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. Now birds are their closest living relatives.
- Order Crocodilia
|Wikispecies has information on: Crocodilia.|
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