The followingoutline is provided as an overview of and topical guide to reptiles:
Reptiles, as commonly defined, aretetrapodvertebrateanimals with anectothermic metabolism andamniotic development. Reptiles traditionally comprise fourorders:Testudines (turtles),Crocodilia (crocodiles,alligators andgharials),Squamata (lizards andsnakes) andRhynchocephalia (tuatara), with about 12,000extant species listed in theReptile Database. The study of the traditional reptile orders, customarily in combination with the study of modernamphibians, is calledherpetology.
A reptile can be described as all of the following:
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