Question

17. Why do birds puff up their feathers in winters?​

Answer 1

Answer:

“A bird's body heat warms the air between its feathers,” Marra explains. “So birds fluff up in the cold to trap as much air in their feathers as possible. The more trapped air, the warmer the bird.”

Answer 2

Answer:

When the birds puff their feathers, they trap large amount of air. The trapped air in turn is bad conductor of heat. Thus, the heat from the body of a bird does not flow out and, hence, it fells warms.