Grand Canyon seeks ways to manage bison herds roaming in northern reaches of national park

April 2, 2014 10:45 PM

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FLAGSTAFF, Arizona — The herds of bison roaming the northern reaches of the Grand Canyon are causing headaches for park staff as the animals graze in pristine meadows, trample vegetation, damage cliff dwellings and pollute water sources.

The bison were introduced to northern Arizona in 1906 as part of a ranching operation to crossbreed them with cattle, creating hybrids known as beefalo or cattalo. The state of Arizona owns and maintains the bison outside the national park, but the animals now are making their home almost exclusivel...

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