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When temperatures drop in Montana, wild bison migrate to lower elevations outside the boundaries of Yellowstone National Park. But once outside, they run the risk of being killed because some carry a chronic disease called brucellosis that ranchers fear could spread to cattle.
Выпуск: Aug 25, 2014
Время выполнения: 27 минут
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Студия: Forest Clay Productions
Страна: United States of America
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