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Reptiles are vertebrates with dry, scaly skin. Reptiles breathe through lungs. Reptiles are cold-blooded animals. Their body temperature changes with the temperature of the environment they are in.

Reptiles can be either diurnal or nocturnal. They vary also in size.Some snakes grow over 30 feet in length, and some turtles have lived longer than 100 years. Some lizards can be as tiny as 4 centimeters inlength, and some turtles weigh over 1 short ton.

Snakes and lizards make up the largest group of reptiles.All reptiles have skin covered with scales, an internal skeleton, and lungs. Some snakes have only 1 lung, while most reptiles have 2 lungs. Some reptiles have glands in their mouths that produce venom.

Reptiles hibernate in winter. They remain in hibernation until the weather gets warm.