A reptile is an air-breathing animal with a body structure comprising of traits from amphibians, birds and mammals. Reptiles are generally scaly and their eggs are fertilized internally. Living reptiles include
crocodiles, tortoises and turtles, snakes and lizards. There are about 6,000 surviving species. Long ago there were many more kinds of reptile, such as the dinosaurs and the flying pterosaurs. Some reptiles lay eggs, but others give birth to live young which need no care from their parents.
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