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For those that can't watch the video, aka tldr, the deers in Yellowstone National Park were apparently very destructive, and the harm caused by them was lessened when wolves arrived. The wolves also reduced the coyote population. Forests recovered which lead to increases in population of other species including eagles, beavers and bears, and there was less soil erosion affecting the rivers themselves.



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tl;dr: wolf good, deer bad



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