How Wolves Change Rivers
Movie DetailsMultiple player options are available. If one player doesn't work, try another. We do not host any content. If no players load, the movie might not be available. You can switch the language from the player dropdown menu.
Overview
When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers? George Monbiot explains.
