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Sciences > Zoology Evolution of the polar bear: 4 of 5

Polar bears as with all bears alive today evolved from the Ursavus who inhabited Asia 22 million years ago, and was the ancestor of all bears. Polar bears began evolving from brown or grizzly bears about 300,000 yrs ago. Evolution of Polar Bear can easily be traced by the fossil transitions, which confirms our knowledge of development of the Polar Bear species. The polar bears of this time period were much larger than they are today, as were many other species. Scientists now believe that the polar bear evolved from a group of brown bears which became isolated by glaciers in an area near S...
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