Reptiles, a various group of air-respiration vertebrates, are characterised by their scaly pores and skin, amniotic eggs, and ectothermic (cold-blooded) metabolism. They are historically labeled into 4 living orders: Crocodilia (crocodiles and alligators), Sphenodontia (tuataras), Squamata (lizards and snakes), read more and Testudines (turtles and