Yellowstone National Park, one of the oldest and largest nature reserves in the world. A 9,000-square-kilometer world of vast plains, green meadows and endless forests, surrounded on all sides by towering mountains. A variety of animal life lives among these natural wonders, including the last American bison herd, the grizzly bear and the gray wolf. Filmed over the course of a year in Yellowstone, this documentary follows the area’s wildlife as they struggle with life and death in one of America’s last remaining wilderness areas.