I saw a pretty cool documentary on how reintroducing wolves to Yellowstone changed the ecosystem for the better. Not the one I saw but very similar: https://ww

I saw a pretty cool documentary on how reintroducing wolves to Yellowstone changed the ecosystem for the better. Not the one I saw but very similar: https://www.youtube.com/watch?v=ysa5OBhXz-Q https://www.youtube.com/watch?v=ysa5OBhXz-Q More serious article: http://www.yellowstonepark.com/wolf-reintroduction-changes-ecosystem/ http://www.yellowstonepark.com/wolf-reintroduction-changes-e...