Genetic and fossil knowledge argues that the two largest lineages of reptiles, Archosauromorpha and Lepidosauromorpha , diverged near the top of the Permian interval. In addition to the living reptiles, there are many various groups that at the moment are extinct, in some instances due to mass extinction events. In explicit, the Cretaceous–Paleogene extinction occasion wiped out the pterosaurs, plesiosaurs, and all non-avian dinosaurs alongside many species of crocodyliforms, and squamates (e.g., mosasaurs).
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When amphibians first appeared, they lived in swampy environments, while reptiles thrived in dryer habitats. Most have four legs, or are descended from four-legged animals (e.g. snakes). Though not traditionally categorized together, reptiles are intently associated to birds. Reptiles have scales on their skin, rather than fragile porous pores and skin.Reptiles are cold-blooded animals with dry, scaly pores and skin. Although no animal is actually simple to take care of, few are so onerous to search out good info on or require as much work as reptiles.