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Birds fluff up their feathers to stay warm on cold days.

Birds fluff up their feathers to stay warm on cold days.

Fluffing traps warm air next to the body, like a cozy jacket. Feathers also help birds fly.

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More facts about Animal Coverings

A polar bear's fur isn't really white — it's clear! A polar bear's fur isn't really white — it's clear! A pangolin is covered in scales made of the same stuff as your nails. A pangolin is covered in scales made of the same stuff as your nails. A turtle's shell is part of its body and can feel a touch. A turtle's shell is part of its body and can feel a touch. Sheep grow wool that keeps them warm, and it keeps growing. Sheep grow wool that keeps them warm, and it keeps growing. The sea otter has the thickest fur of any animal. The sea otter has the thickest fur of any animal.