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We're here in Yellowstone National Park to follow some gray wolves and observe the deadly brilliance of the pack.@Theyfve learned to cooperate, hunting their prey with many acting as one pack.@This mother grizzly knows how to protect its cub and itself. Stand your ground. Donft be intimidated.@Donft let the gray wolves run you down. Grizzly mum stands up to the gray wolves. And eventually, they lose interest. Stand up, hold your ground. Wolves know that large prey can be dangerous if they fight back. What the wolves want is to get their prey on the run. Like, for example this herd of elk. Now, the wolves can fan out over the herd, waiting for an old or sick or just unlucky elk to make a wrong move. The alpha male leads the hunt. He bides his time, directing his troops. And eventually, one elk stumbles. The hungry wolves quickly surround their faltering victim. They swarm in for the kill, and then, the meal. Wolves are a vital part of a healthy Yellowstone ecosystem. They filter out sick and weak animals in herds...and help scavengers survive by providing leftovers from their hunts. This coyote, however, is not only a scavenger but also a competitor, who's been interfering with the kills of the pack.@So once again, the wolves use cooperation to guard their turf and drive out the intruder.