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Penguins breed during the antarctic winter, and often have to stand around in freezing, snowdriven blizzards for hours on end. They withstand such conditions by having a very dense plumage all over the body (unlike the plumage of other birds). Underneath this thick coat of closely packed feathers, there is also an insulting layer of blubber. The blubber helps in the maintenance of body warmth, and acts as a store of nutrition as well. If temperature drop too low, penguins restore to huddling together in an attempt to conserve body heat.
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