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The sea otter has the thickest fur of any animal.

The sea otter has the thickest fur of any animal.

An otter can have hundreds of thousands of hairs in one small patch. All that fur keeps it warm in cold water.

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