For generations, grizzlies reigned unchallenged as the top predators of Yellowstone. Everything changed when an old rival returned to the landscape. After almost a century without them, wolves were reintroduced to Yellowstone and again play a vital role in the ecosystem that depends upon them. Once the sole rulers of this vast kingdom, grizzly bears are now re-learning how to cope with the rise of an equal competitor. This story documents the two apex predators of Yellowstone as they once again meet head-to-head vying to emerge on top.

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Documentary