What color is the fur of a polar bear?

The fur, which appears to be white, is actually made up of almost colorless, almost transparent hairs. The hairs are not truly transparent. They contain keratin.

Keratin is almost clear but is off-white, the same as your fingernails, which are also composed of keratin. Viewed side-on, the hairs appear colorless; viewed lengthwise (as if one were looking down a telescope) the hairs no longer appear transparent Reflection of the sunlight from the densely packed, almost colorless hairs makes polar bears appear to be white in a sort of optical illusion The long, coarse guard hairs are hollow, letting the warming rays of the sun reach to the dark skin that acts as a solar heat collector. The air-filled guard hairs also help insulate them from the cold temperatures.

The hairs of the thick undercoat are also nearly colorless but are not hollow For many years, scientists operated under the theory that the individual hair might act as fiber optics taking sunlight directly to the skin. This has recently been proven to be incorrect Surprisingly, the polar bears' skin color is black. The bears' black skin absorbs heat from the sun.

Under the skin is a thick layer of fat in healthy individuals. Even in the coldest Arctic weather, the polar bear is very comfortable. The Polar bear can swim in ice laden sea water quite comfortably.It is more in danger of hyperthermia (over-heating) then hypothermia (freezing).

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