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adding information to page on reptiles
'''Reptiles''' are a class of [[ectothermic]] ("cold-blooded") [[animal]]s found throughout the world. Reptiles are [[vertebrate]]s, as they have an internal skeleton and a backbone. They are also amniotic tetrapods and their skin protects them from drying out. Common reptiles include [[alligator]]s, [[lizard]]s, [[snake]]s, and [[turtles]].
'''Reptiles''' are a class of [[ectothermic]] ("cold-blooded") [[animal]]s found throughout the world. Reptiles are [[vertebrate]]s, as they have an internal skeleton and a backbone. They are also amniotic tetrapods and their skin protects them from drying out. Common reptiles include [[alligator]]s, [[lizard]]s, [[snake]]s, and [[turtles]].
Because some reptiles are more closely related to birds than they are to other reptiles (e.g., crocodiles are more closely related to birds than they are to lizards), the traditional groups of "reptiles" listed above do not together constitute a monophyletic grouping or clade (consisting of all descendants of a common ancestor). For this reason, many modern scientists prefer to consider the birds part of Reptilia as well, thereby making Reptilia a monophyletic class, including all living Diapsids.
{{Reptilia}}
{{Reptilia}}