Reptile is an animal that has dry, scaly skin and breathes by means of lungs. There are about 8,000 species of reptiles, and they make up one of the classes of vertebrates (animals that have a backbone). Reptiles include alligators, amphisbaenians, crocodiles, lizards, snakes, tuataras, and turtles.
The various species of reptiles vary greatly in size. For example, pythons grow more than 30 feet (9 meters) long, and leatherback turtles may weigh more than 1 short ton (0.9 metric ton). On the other hand, some species of lizards measure no more than 2 inches (5 centimeters) long.
Many people fear reptiles, but most species are harmless and avoid human beings if possible. The Nile crocodile and the saltwater crocodile may attack and kill people. The Gila monster, the Mexican beaded lizard, and numerous snakes, including the rattlesnake, have venomous (poisonous) bites.
In many parts of the world, people eat reptiles and reptile eggs. Some reptiles, including alligators, crocodiles, lizards, and snakes, are hunted for their skin. Manufacturers use the skin as leather for belts, shoes, and other products. The United States government prohibits the import of the hides of those reptiles classified as endangered species.
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