Trophic Cascade at Yellowstone National Park

One of the most exciting scientific findings of the last 50 years is called a trophic cascade.

A trophic cascade starts at the top of the food chain and tumbles to the bottom. One of the best examples of this happened in Yellowstone National Park in 1995 when wolves were reintroduced.

Watch the video to see how everything changed - even the river!

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