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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.

The shell is joined to the turtle's backbone and ribs. A turtle can never crawl out of its shell.

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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. 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.