Here’s an interesting video that was sent to me by a person who has no particular interest either way when it comes to Wolves, rivers or fish. He just thought I might be interested in it. The film-maker George Monbiot purports that a Trophic Cascade effect has taken place in YNP since the reintroduction of Wolves, resulting in much improved habitat for many inhabitants of that ecosystem. He quotes no specific data or studies in the film. Before you comment here, read the long list of comments below the video on Youtube, or better yet here at Films For Action. Interesting. A polarizing figure and subject.