Dr Doug W. Smith, Project Leader of Gray Wolf Restoration Project in Yellowstone National Park, tracking the movement of the wolves
A growing number of scientists are discovering that removing top predators from the wild has thrown ecosystems off-kilter, triggering domino effects that scientists are just beginning to understand. NOVA follows scientists who are trying out a simple but controversial solution: returning apex predators — like coyotes, bears and panthers — to their natural environments. Can these newly introduced predators restore the natural balance of their ecosystems without threatening the humans who live among them?

Nova: Wild Predator Invasion, Wednesday at 9 p.m. on PBS 6.

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