[http://youtu.be/ysa5OBhXz-Q] (YouTube link)Our natural ecosystem is a delicate balance. When you take one part of it away, the results can be unforeseen and even catastrophic. But Sustainable Man tells us a story of one...https://www.neatorama.com/2014/02/15/How-Wolves-Change-Rivers/
How Wolves Change Rivers...
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