Reptiles have been around for more than 300 million years and have evolved significantly since their earliest forms in the Carboniferous period. They descended from amphibians as a result of needing to lay eggs on land rather than in water. While not all reptiles lay eggs, those that do have leathery shells instead of bird-like shells. Reptiles are vertebrates with spinal columns and backbones and are cold-blooded, meaning they rely on their environment to regulate their body temperature. They typically have scales, and some have bony external plates for protection.Reptiles conserve energy by lying still and waiting for passing prey, as they have a low resting metabolism and a cold internal temperature. Most are carnivores, but some reptiles, such as turtles and iguanas, are mostly herbivorous. Many reptiles reproduce sexually, but some are capable of asexual reproduction, and some reptiles' offspring's sex is determined by the egg's incubation temperature.Reptiles have become popular as exotic pets, with many species suitable for keeping in captivity. Geckos are a good starting point for those interested in keeping reptiles as pets, as they are low maintenance and attractive. Some reptiles are known for their ability to form bonds with their owners and enjoy treats. However, it is important to note that not all reptiles are suitable for captivity, and their welfare must be carefully considered.