What are reptiles?

 

                     Reptiles evolved from amphibians, but there are several important differences between these two kinds of animal. The most obvious difference in the living animals is that reptiles have scaly skin to prevent their bodies from drying out, while amphibians have thinner, moist skin. Reptiles also have a more efficient heart and kidneys to equip them for living on land, and they have evolved more efficient ways of walking. It is not so easy to tell the difference between reptiles and amphibians when examining fossils because the soft parts of the body are nut preserved. However, there are important structural changes in the skeleton that can be observed.

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