One hour video: Animals National Geographic Wild - The Most Extreme Predators. Yellowstone National Park is a world of predators, scavengers and opportunists. In this vast and complex kingdom, two dominant predators reign supreme: the grizzly bear and the wolf. Size and power square off against speed and teamwork, as mighty grizzly bears contend with powerful packs of wolves for control of the food supply. Normally these two fearsome hunters would rule their ranges uncontested, but in Yellowstone they must share resources, or face starvation.