Did you know that some male alligators can exceed 15 feet and 500 pounds? When it comes to a scary animal, nothing is more menacing than an alligator or crocodile. These large, sharp-toothed reptiles remind us of the serpents and dragons lurking in our imaginations. Crocodilians (the group name for alligators and crocodiles) lived alongside the dinosaurs millions of years ago, snapping and chomping their way through history to the present day—where they survive as the world's largest reptiles.