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How Wolves Change Rivers poster

MOVIE

How Wolves Change Rivers

2014 · 5 min · Documentary

When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers? George Monbiot explains.

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Creators

George Monbiot — Director

Top cast

George Monbiot portraitGeorge MonbiotNarrator

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