Yellowstone - The Wolves are Back | Wildlife Documentary

In 1926 the last wolf was killed in Yellowstone National Park. For 70 years the top predator was missing and elk, its prey, increased dramatically to over 20,000, turning vast areas of Yellowstone into an ecological disaster zone, browsing down the woody vegetation to almost nothing. In 1995 wolves were reintroduced. Now, 20 years later, the ecosystem of the park has turned back into balance.

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