Question

Why do polar bears have black skin

Answer 1

Polar Bears have stark white coat which camouflage in the surrounding snow and ice. BUT..... under their fur, polar bears have black skin because the better to soak in the sun's warming rays.(BTW.... Really Good Question!)
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Answer 2

The bear's stark white coat provides camouflage in surrounding snow and ice. But under their fur, polar bears have black skin—the better to soak in the sun's warming rays. These powerful predators typically prey on seals.