This video is amazing. It illustrates how taking a native species out of an environment causes that environment to tilt and list and go off kilter. Put that species back and balance is restored. When wolves were reintroduced in Yellowstone National Park in 1995, everything changed, included the courses of the rivers.

It reinforces my belief that everything’s connected and everything needs everything else.

This process, of a predator changing the behavior of its prey, which then eases pressure on that prey’s prey, and so on down the line, is called a trophic cascade.

Audio is taken from a talk given at TEDGlobal 2103 by environmentalist George Monbiot .

Check the links to learn more.

TED Radio Hour: Everything is Connected
(listen to the show here)
Wikipedia: Trophic Cascade
Yellowstone National Park