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When wolves were reintroduced to Yellowstone National Park after being absent nearly 70 years, something astounding happened.

 
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This amazing phenomenon is called "trophic cascade."  It is an ecological process that starts from the top of the food chain and reaches the base. 
It changed the entire ecosystem - even the rivers.  "When we try to pick out anything by itself, we find it hitched to everything else in the Universe."
John Muir (1838-1914).  Narrated by George Monbiot.  Music by Chris Zabriskie.

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