These breathtaking gray wolves were eradicated from Yellowstone National Park with the decline of the Aspen tree. What park rangers soon realized was how much the ecosystem was changing since they left. Once the fierce predators were gone, the elk began to dominate the park and feed on baby Aspen trees, a North American tree. Rangers reintroduced the gray wolves to stabilize the dangerously increasing Elk population.

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  • 17 April 2013
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