So far the hazing has been relatively low-scale: initial reports have the Montana officials using a helicopter to guide 140 bison in Gallatin National Forest back into Yellowstone National Park boundaries and nine bison near West Yellowstone back into the Park.
The bison are being force back into the Park to prevent any interaction with cattle gazing outside Park boundaries. Montana officials and cattlemen believe bison can transmit buscellosis, a disease that can force a pregnant cow to spontaneously abort its fetus, to cattle. Bison advocates and outside experts disagree with that prognosis — elk are much more likely to transmit the disease to cattle — to no avail, and so the buffalo are not allowed to roam.
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