http://literacynet.org/cnnsf/bison/storyweek.html
Summary:
If the winter weather is bad, the bison may went out of Yellowstone National Park in search of food. Because they may infect local cattle with brucellosis, Montana officials set a policy called hazing, which means they will chase those bison back into the park, but if they don't go, they will be killed. Volunteers start an action to find those bison back without being hazed or killed. Actually, there are too many bison in Yellowstone, and finding them back is costly to taxpayers. Montana cattle have economic value, so the officials have to take concern about them, even though the bison are endangered.
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