Reptiles have dry, scaly skin that protects their bodies and helps retain moisture. They breathe with lungs and are ectothermic. That means their body temperature depends on the warmth of their surroundings. Because of this, reptiles are often seen basking in the sun to warm up.

Most reptiles lay eggs with leathery shells on land, although a few species give birth to live young. Reptiles can live in many different habitats, including deserts, forests, wetlands, and oceans.

Reptiles play an important role in nature. Many are predators and help control insect and small-animal populations, while others serve as food for larger animals.