Polar bears in zoos have been known to turn green. Concrete floors in their pens scrape against the fur. The abrasions form tiny holes in their hairs, opening a gateway for algae that can live and breed inside. But on a cloudy day, the bears can look slightly gray. At sunset, they can appear reddish-orange. Normally, polar bears look white. That's because their fur is scattering sunlight, which is also white. The result? The fur can appear as different colors under different lighting. When light strikes the outer fur some of it is absorbed while the rest is scattered away. Turns out, they can come in all sorts of colors: yellow, gray, orange, and even green. That's because polar bear fur is transparent and hollow.
Their color is determined by the lighting and climate of their surroundings.
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