Reptiles can be easily recognized by their horny or scaly skin. The class Reptilia has 4 orders. The order Rhynchocephalia includes only 1 living species, the tuatara, which is native to New Zealand. The order Crocodilia includes alligators, caimans, crocodiles, and gharials (a crocodilian species native to the Indian subcontinent). The order Testudines contains tortoises and turtles, also called chelonians. The order Squamata includes lizards and snakes.