Polar Bears

Polar bears are the top predator in the arctic marine ecosystem and the largest terrestrial carnivore. They evolved from brown bears during the Pleistocene, the time period that spanned from 1.8 million to 11,000 years ago.

The polar bear's coat, covering it completely except for the nose and foot pads, is superbly adapted to Arctic environments. Along with a thick layer of body fat, the water-repellent coat insulates the bear from cold air and water. It also serves as camouflage; in fact, polar bears can sometimes pass as snow drifts. Surprisingly, the fur has no white pigment.

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