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Why birds are often seen to swell their feathers in winter?
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Answers
By swelling their feathers, the birds provide air pockets round their body. The air is trapped in the swelled feathers which provides the birds a heat insulation from surrounding.
Birds often swell their feathers in winter because it traps air around the bird and thus does not enable heat loss from the body . This protects them in cold weather .
Explanation :-
The birds swell their feathers which makes their feathers collect air around their body .
The air gets trapped and these are called air pockets .
These air pockets act like a heat insulator and they do not allow heat to pass through them .
This ensures that heat is not lost from the body of the bird .
Preventing heat loss protects the birds from extreme cold weather in winter ,
Hence they swell their feathers in winter .