You’ve heard of wolves in sheep’s clothing. But what about a wolf dressed as a terraformer?

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? Well, they didn’t have to go to the top undergraduate engineering schools to get it done: George Monbiot explains in this movie remix.


Want to learn about more cool animals? Check out our list of sea creatures you’ve probably never even seen!

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