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Dissimilarity between Reptiles and Birds

How reptiles and birds are different regarding the maintenance of the body temperature? Whether birds are rare in Polar Regions?

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Reptiles are heterothermic, which says that they do not control the temperature of body. Birds though are the first homoeothermic animals; which means that they are able to maintain their body temperature constant. There exist several birds which live in the intense cold regions. Penguins are examples of birds which live in the polar region.

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