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reptiles Reference library
The Oxford Companion to the Earth
Reptiles, together with birds and mammals, constitute a single monophyletic group (an ancestor and all its descendants) that is called ...

Reptiles Reference library
Encyclopedia of Evolution
Reptiles, the Reptilia, are a group of amniotes, four-legged vertebrates that differ from amphibians in possessing adaptations permitting full terrestriality, ...
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