Swamp critters include crocodiles and alligators. Crocodiles, or 'CROC' for short, are large reptiles with long snouts and powerful jaws. They inhabit freshwater habitats in tropical regions around the world. Alligators, or 'gators' for short, are also large reptiles with long snouts and powerful jaws. They inhabit freshwater habitats in the southeastern United States. Both crocodiles and alligators are apex predators in their respective habitats and can be dangerous to humans.