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.
YouTube link
(thanks Cora)
1 comment(s):
I suppose other parts of the forest were less fortunate :-)
Lucy
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