One semi-useful piece of information. There is a quick way to distinguish crocodiles from alligators (say, if you see them in a movie and someone starts a completely pointless but nonetheless crucially important argument over which that scaly thing was). Alligators' mouths are hinged to open the top of the jaw up. Crocodiles are designed to open the bottom jaw down. So for God's sake, if you're out gator whomping and the target approaches you with the top of the snout still in the water, get back in the boat.