Manatees are large, gentle marine animals that have been around for millions of years. They are found in many different warm environments. Manatees have large, round bodies that are gray in color and are usually around 8-13 feet in length, and weigh anywhere from 800-1,300 pounds. They have two small forelimbs, or flippers, that they use to help them steer and navigate the water. They also have a small, flat tail that helps them swim with little energy.