How Wolves Change Rivers

"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." - John Muir

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 in this movie remix.

This is really interesting. Were the positive effects on the ecosystem a surprise to the people who made the decision to reintroduce the wolves? Either way, so cool!

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