Birds puff up their feathers in winter.

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Birds puff up their feathers in winter.

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Detailed Solution

The above statement is True.
Birds fluff up in the winter season to trap as much air in their feathers as possible because by doing so they trap a large amount of air in their body which in turn acts as an insulator and does not allow the heat from their bodies to flow out. This way Birds' feathers are designed to keep them warm and waterproof during the winters.

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