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Up to 900 bison may be culled from Yellowstone NP herd in this year's reduction program

Work has begun at Yellowstone National Park to cull 600-900 animals from the park's bison herds, a process deemed necessary to keep the bison population in check but which is highly controversial.

There are an estimated 4,900 bison in Yellowstone, and back in December the Interagency Bison Management Plan partners recommended the culling number for this winter. The operation began Sunday, when bison started to move out of the park into the Gardiner Basin just to the north in Montana. The operation could continue through late March, park staff said Monday.

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