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.
Taxonomy[change | change source]
- Order Crocodilia