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Reptiles are cold-blooded amniotes. Reptiles are covered by scutes or scales and they are tetrapods and lay eggs. There are four orders of reptiles, Crocodilia (e.g. crocodiles), Sphenodontia (e.g. tuatara), Squamata (e.g. snakes and lizards) and Testudines (e.g. turtles).
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