When wolves were reintroduced to Yellowstone after being gone for 70 years, they had a huge effect on the park. Mindblowingly bigger than you’d think.

We all know that wolves kill various species of animals, but what we’re slightly less aware of is that they give life to many others – and what’s also really interesting is how wolves changed the behavior of the rivers. George Monbiot explains in this beautiful film.

video from Sustainable Man – narrated by George Monbiot

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