Reptiles are cold-blooded, which means that they must heat themselves up by placing themselves in different locations in the environment (in the sun to heat them up, in the shade to cool them down). They breath air. They are covered in scales. They also usually lay eggs.
Notable reptiles include turtles, lizards, crocodiles, and snakes. They do NOT include frogs and salamandars, which are amphibians.
Reptiles have scales, are exothermic (cold blooded) vertebrates, and they are terrestrial.
Reptiles share unique anatomical traits, including special modifications of their skin and eyes, the skull and backbone as they are vertebrates, external nasal glands, typically dry skin covered with scales which they shed their skin all at one time instead of gradually, the eggs they lay are leathery, and they are cold blooded.
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