Two Native Americans paddle their canoe across a lake, just offshore, on a foggy morning. A black bear sow is none too pleased and has sent her cub up a nearby birch tree for safety. The American black bear, Ursus americanus, is the smallest of the three bears species found in North America, and are found only in North America. Although they all live in North America, black bears are not closely related to brown bears and polar bears; genetic studies reveal that they split from a common ancestor 5.05 million years ago. |
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