Reptilia provides a summary of key facts about reptiles: - Reptiles can be found almost anywhere except Antarctica and other very cold places, and can live on land or in water. Their environment is important for regulating their temperature. - Reptiles enjoy basking in the sun, relaxing in the afternoon, walking, hunting, swimming, and finding mates. Their ancestors were mostly carnivorous and ate small, high-energy prey like insects. - Reptiles have specialized features like camouflaging scales, a three-chambered heart, lungs, venom and strong jaws for hunting large prey, and some can reproduce asexually.