How wolves change rivers
When wolves were re-introduced back into Yellowstone National Park about 20 years ago, there was much debate about whether or not it was a good thing. It was thought by some that introducing a wild, vicious animal like a wolf into a region that had been free of them for such a long time, was definitely not a good idea.
By watching this short video however, you can see how wolves not only transformed Yellowstone’s eco-system but also its physical geography.
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