A reptile is an air-breathing animal with a body structure between that of the amphibians and the birds and mammals. Reptiles are generally scaly and their eggs are fertilized internally.
Living reptiles include crocodiles, tortoises and turtles, snakes and lizards. There are about 6,000 surviving species. Long ago there were many more kinds of reptile, such as the dinosaurs and the flying pterosaurs.
Picture credit: google
