Grizzly bears top North America's food chain, but a surprisingly short list of animals and forces can still bring one down.

A pack of six wolves chased a grizzly bear away from a bison carcass in Yellowstone National Park, Wyoming. Videographer ...

Add Yahoo as a preferred source to see more of our stories on Google. Witness the raw intensity of nature as a powerful grizzly bear confronts a relentless pack of 10 wolves. The bear relies on its ...

Add Yahoo as a preferred source to see more of our stories on Google. Grizzly bears are one of the largest predators in North America. One-on-one, there's no question about who would win a fight ...