The following outline is provided as an overview of and topical guide to reptiles:
Reptiles , as commonly defined, are a group of tetrapods with an ectothermic metabolism and amniotic development . Living traditional reptiles comprise four orders : Testudines , Crocodilia , Squamata , and Rhynchocephalia . About 12,000 living species of reptiles are listed in the Reptile Database . The study of the traditional reptile orders, customarily in combination with the study of modern amphibians , is called herpetology .
A reptile can be described as all of the following:
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