Polar bears must hunt with great stealth and patience. Fortunately, their white coloring helps them blend in with their icy surroundings. 

Their long outer hairs, which protect their soft, thick undercoat, are hollow and transparent. The thinner hairs of their undercoat are also colorless.

Polar bear hair looks white because the air spaces in the hairs scatter light of all colors. When something reflects all of the visible wavelengths of light, we see the color white.

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A polar bear has white fur to blend up with the white snow of its habitat. By this it escapes from its predators