Crocodiles are the ultimate lurkers. Camouflaged by the surrounding environment, they lie in wait for potential victims who are unaware of the danger until it's too late. This stealthy and extremely violent predator boasts long, powerful jaws and teeth, and preys on a variety of animals. Some species, such as the Nile crocodile, which can grow up to 20 feet long, can bring down exceptionally large prey, like zebras and buffalo. Its typical mode of attack is to wait at the water's edge for an animal to come to drink and then drag the hapless creature underwater. They then spin the victim around forcefully and repeatedly in order to tear off chunks of flesh, causing fatal wounds. Known as the "death roll," this experience is about as pleasant as it sounds.