Reptiles, a diverse team of air-respiration vertebrates, are characterised by their scaly skin, amniotic eggs, and ectothermic (chilly-blooded) metabolism. They may be customarily labeled into four living orders: Crocodilia (crocodiles and alligators), Sphenodontia (tuataras), Squamata (lizards and snakes), and Testudines (turtles and tortoises). b