Reptiles

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Reptiles, like amphibians, make up a fairly small proportion of terrestrial animals—but in the form of dinosaurs, they ruled the earth for over 150 million years. There are four basic types of reptiles: crocodiles and alligators, turtles and tortoises, snakes, and lizards. Reptiles are characterized by their cold-blooded metabolisms—they fuel themselves up by exposure to the sun—their scaly skin, and their leathery eggs, which, unlike amphibians, they can lay some distance away from bodies of water.