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Polar bears have fur to keep themselves warm. Underneath is lots of fatty tissue and thick fur. If they didn't have it then they wouldn't be able to adapt to their environment and would freeze. The fur acts as a barrier between their skin and the water and helps them survive the brutal winds, freezing water and cold weather of the Arctic. Polar bears actually have transparent fur over black skin. Reflection of the sunlight from the densely packed transparent hairs makes polar bears seem to be white. The bears' black skin absorbs heat from the sun. The transparent fur is made up of hollow hairs called guard hairs. These air-filled guard hairs help transmit heat from the sunlight to the polar bear's black skin as a solar heat collector. In turn, the reflection stops the heat being lost from their black skin. Their fur is also waterproof, so it helps keep the bears warmer when they are in water.

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15y ago

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