If a wolf pack can bring down a bison, or locate a dead or dying bison, the carcass can sustain the pack for days.

In Yellowstone National Park, when a bison dies it’s not long before wolves or grizzly bears move in on the carcass. If one or two wolves are on the carcass, a lone grizzly bear can usually clear them ...

With their immense size and pugnacious attitudes, bison have few natural predators. Their natural enemies include humans, ...