How different are birds and reptiles, Biology

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Q. How different are birds and reptiles concerning the maintenance of body temperature? Are birds rare in polar regions?

Reptiles are heterothermic that is they do not control their body temperature, Birds conversely are the first homeothermic animals, and they are able to maintain their body temperature constant.

There are many birds that live in intense cold regions Penguins are instance of birds that live in polar region.

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