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.
Broad fish tapeworn (Diphyllobothrium ursi)
The fish tapeworm is the longest human tapeworm. Sheds a million eggs a day and has up to three thousand proglottids. If raw fish is eaten, humans are a definitive host. The bear and human intestine is its biological niche. The tapeworm is flat and is virtually a sack of sexual organs and eggs. It is a myth that this tapeworm consumes enough food to cause the host to lose weight.
fish tapewormhuman tapewormproglottidstapewormsack of sexual organs and eggstapeworm eggshuman intestine biological nicheflat tapewormtapeworm picturestape worm picturestapeworm photoslongest human tapewormfish tapeworm pictureshuman tapeworm pictureshuman tapeworm photosdiphyllobothriumdiphyllobothrium latumcestodes
