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[wolves howling] -[narrator] One of the most exciting scientific findings of the past half-century has been the discovery of widespread trophic cascades. A trophic cascade is an ecological process which starts at the top of the food chain and tumbles all the way down to the bottom. And the classic example is what happened in the Yellowstone National Park in the United States when wolves were reintroduced in 1995. Now, we all know that wolves kill various species of animals, but perhaps were slightly less aware that they give life to many others. Before the wolves turned up-- theyd been absent for 70 years-- the numbers of deer, because there was nothing to hunt them, had built up and built up in the Yellowstone Park, and despite efforts by humans to control them, theyd managed to reduce much of the vegetation there to almost nothing. They had just grazed it away. But as soon as the wolves arrived, even though they were few in number, they started to have the most remarkable effects.
