https://www.youtube.com/embed/ysa5OBhXz-Q?feature=player_embedded
I had watched a one hour one on wolves about the same amazing process. But cannot find it.
http://www.pbs.org/wnet/nature/the-wolf-that-changed-america-video-wolf-expert-doug-smith-on-the-yellowstone-wolf-project/4332/
Really interesting how small things can change a entire area.
Enjoy