Polar bears also have a thick layer of fat below the surface of the skin, which acts as insulation on the body to trap heat. The skin under the polar bear's fur is actually black this black is evident only on the nose. The bear's outer layer of fur is hollow and reflects light, giving the fur a white color that helps the bear remain camouflaged. Many of the polar bear's physical adaptations help it maintain body heat and deal with its icy habitat. A newborn polar bear weighs only about 1.5 pounds. Bears can weigh about 50 percent more after a successful hunting season than they do at the start of the next most of this additional weight is accumulated fat. A large male can weigh more than 1,700 pounds, while a large female is about half that size (up to 1,000 pounds). Male polar bears are much larger than the females. They are about seven to eight feet long, measured from the nose to the tip of their very short tail.
Polar bears are the largest carnivorous land mammals on Earth.
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