Alligators are those fierce creatures that have lots of sharp teeth, so BEWARE! They are related to crocodiles. The American alligator lives in waters and lowlands of the southeastern United States. Alligators resemble lizards in their shape, but they have thicker bodies and tails. These creatures swim by moving their tails from side to side. The male alligator is usually larger than the female alligator, growing up to 18 feet and weighing from 450 to 550 pounds. Female alligators are usually no more than 9 feet and usually weigh no more than 160 pounds. Alligators eat many kinds of small animals that live in or near the water, including fish, snakes, frogs, turtles, small mammals and birds.