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  • Reptiles, the class Reptilia, is an evolutionary grade of animals, comprising today's turtles, crocodilians, snakes, lizards and tuatara, as well their extinct relatives. A monophyletic definition of the clade including the above groups would also include dinosaurs and birds, since the common ancestor of all reptiles is also the common ancestor of birds and dinosaurs, as discussed below. However in common parlance birds are not considered to be reptiles, although like reptiles they have scutes on their feet and legs, and are oviparous. Dinosaurs were traditionally classed as reptiles, although there is now substantial evidence that they did not, or did not all, manifest the typical characteristics of "common-parlance" reptiles, such as a sprawling posture, ectothermy, and scales, rather than fur or feathers. In the common definition, a reptile is any amniote that is neither a mammal nor a bird. The study of reptiles, historically combined with that of amphibians, is called herpetology.

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