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Reptiles and birds-body temperature

How dissimilar are reptiles and birds regarding the maintenance of body temperature? Are birds rare in Polar areas?

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Reptiles are heterothermic, that is, they do not control their body temperature. Birds though are the first homeothermic animals; they are capable to maintain their body temperature stable. There are numerous birds which live in intense cold areas. Penguins are illustrations of birds which live in polar area.

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