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What is the function of hairy coat in mo...

What is the function of hairy coat in most mammals , blubber in whales and seals and feathers , birds ? How do these animals regulate their body temperature ?

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These animals have insulating coat of hair or blubber or feathers to check loss of body heat.
These animals regulate their body temperature by physiological means and maintain more or less constant internal temperature . They are , thus , termed endotherms.
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