Wolves and grizzly bears are the only large predators of adult bison.
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Foundations established by Turner include the Turner Endangered Species Fund and Captain Planet Foundation. He also owns the largest private bison herd in the world.
Bison - National Park ServiceBison are the largest mammals in Yellowstone National Park. They are strictly vegetarian, a grazer of grasslands and sedges in the meadows, the foothills, and even the high-elevation, forested plateaus of Yellowstone. Bison males, called bulls, can weigh upwards of 1,800 pounds.