Question

Why birds fluff out their feathers in winter?​

Answer 1

because they are feeling cold

and their wings are of fur fur provides warmth to them

please mark my answer as brainlist

and follow me

Answer 2

Answer:

1) The birds fluff out thier feathers to trap heat , when they fluff thier feathers they actually take air which doesn't easily get lost in the surroundings and hence they stay warm.

I hope it helps you.