Reptiles, a various team of tortoise, air-breathing vertebrates, are characterized by their scaly skin, amniotic eggs, and ectothermic (cold-blooded) metabolism. They are customarily classified into 4 dwelling orders: Crocodilia (crocodiles and alligators), Sphenodontia (tuataras), Squamata (lizards and snakes), and Testudines (turtles and tortoise