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Air is an insulator. Air trapped in the puffed up feathers of the bird is warmed by the birds own body heat and stays trapped close to the birds skin. This is similar to how a divers wet suit works. The water of a wet suit is warmed by the heat of the divers body and is trapped within the space between the skin and the material of the wet suit which insulates the diver from the much colder water surrounding them.

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12y ago
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11y ago

By fluffing up their feathers birds trap extra air around their bodies which acts as heat insulation and reduces heat loss from their bodies.

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14y ago

it helps them to keep warm

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12y ago

Insulation from the cold.

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