Reptiles are tetrapod animals in the class Reptilia /rɛpˈtɪliə/, comprising today's birds, turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives. Modern reptiles inhabit all the continents except Antarctica, although some birds are found on the periphery of Antarctica. Several living subgroups are recognized: Testudines (turtles and tortoises), 360 species; Rhynchocephalia (tuatara from New Zealand), 1 species; Squamata (lizards, snakes, and worm lizards), about 10,954 species; and Crocodilia (crocodiles, gharials, caimans, and alligators), 27 species, and Aves(or Neornithes), about 18,000 species.

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