Crocodilians

Crocodilians, the order Crocodilia are an order of large, carnivorous semi-aquatic reptiles that first appeared 83.5 million years ago in the Late Cretaceous period (Campanian stage) and are the closest living relatives of birds. The order is made up of modern crocodiles, alligators, gharials and caimans along with their extinct relatives such as deinosuchus.