In 4 minutes it discusses the shift in multiple levels of environmental change--all brought about over the course of the reintroduction of wolves that were once absent for nearly 70 years at Yellowstone National Park. This change is called a "trophic cascade," which happens when a top predator is either added or removed from a predator-prey food chain situation. Over time the entire ecosystem is transformed.
It shows us the power of biodiversity!
For a visual about how wolves have kept "Yellowstone in balance," check out this infographic:
Video from https://www.youtube.com/watch?v=ysa5OBhXz-Q; photo from http://sacredecologyfilms.com/how-wolves-change-rivers/, & "Wolves Keep Yellowstone in Balance" in http://www.themudflats.net/wp-content/uploads/2014/03/wolves-info-850-614x700.jpg
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