Crocodiles appeared about two hundred million years ago. They coexisted and hunted the large dinosaurs and are the last survivors of the group of archosaurs, which means "ruling reptiles", a group that also included the dinosaurs and pterosaurs - flying dinosaurs - and more. They overcame geological cataclysms, planetary climatic changes, continental drift and even humans action. What made them surpass all their contemporaries and last until today?