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Bison cause problems at the Grand Canyon




American Bison (also known as Buffalo) join the morning commute on Highway 89 at Yellowstone National Park, Wyoming on June 1, 2011.  In the early 1800's, an estimated 65 million bison roamed throughout the continent of North America but  hunting and poaching had a devastating effect on their population and by 1890, fewer than 1,000 remained. Today there are an estimated 4000 bison in Yellowstone National Park.
American Bison (also known as Buffalo) join the morning commute on Highway 89 at Yellowstone National Park, Wyoming on June 1, 2011. In the early 1800's, an estimated 65 million bison roamed throughout the continent of North America but hunting and poaching had a devastating effect on their population and by 1890, fewer than 1,000 remained. Today there are an estimated 4000 bison in Yellowstone National Park.
MARK RALSTON/AFP/Getty Images

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Yellowstone National Park also has plenty of trails and it has long been home to the iconic bison, but since the late 1990s the animal has also made the Grand Canyon its home.

That herd has grown too big and is now over-grazing park land, draining already low water resources and trampling through archaeological sites. From the Fronteras Desk, Laurel Morales reports from Flagstaff.