<span>How Wolves Change Rivers</span> video ▶
<span>How Wolves Change Rivers</span>

How Wolves Change Rivers

Genre: Documentary
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.
Actor: George Monbiot
Director: George Monbiot
Country: United States of America, United Kingdom