Reptiles are cold-blooded animals that like everywhere on earth, except the polar ice caps. If they lived here, they would freeze to death. They are most commonly found along the equator, where it is warm year round. Reptiles have lived on earth for 310 million years. Today, there are 9,000 species of reptiles. There are three dietary groups of reptiles: carnivores, herbivores, and omnivores. Carnivores (like alligators) eat meat. Herbivores (like tortoises) eat plants. Omnivores (like turtles) eat both plants and meat.