North American Bear Program (sample photographs and notes)
All North American bears descended from Etruscan bear stock in Asia.
First to arrive in North America 2.5 million years ago was the black bear.
Brown bears made their way to North America 300,000 years ago by way of the Aleutian land bridge.
DNA evidence confirms the polar bear evolved from the brown bear 150,000 years ago.
There are grizzly bear hybrids, where a polar bear and grizzly have produced offspring.
In North America there are an estimated 750,000 black bears, 60,000 brown bears and 25,000 polar bears.
Read More First to arrive in North America 2.5 million years ago was the black bear.
Brown bears made their way to North America 300,000 years ago by way of the Aleutian land bridge.
DNA evidence confirms the polar bear evolved from the brown bear 150,000 years ago.
There are grizzly bear hybrids, where a polar bear and grizzly have produced offspring.
In North America there are an estimated 750,000 black bears, 60,000 brown bears and 25,000 polar bears.
Black bears will usually have one to three cubs and can have as many as five depending on body fat content and other factors. The cubs will stay with the mother for a year and half. Black bears in the eastern United States usually have more cubs than in the west. Siblings may all have different fathers. Black bear cubs will weigh between 5-10 pounds when they leave the den. Birth weight of all cubs ia about one pound. scottdavisphotos.com
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