Ecosystems are fragile. During the 1920', wolves within Yellowstone National Park were viewed as a nuisance and were hunted to extermination. The entire ecosystem started to unravel as a direct result. In 1995 wolves were artificially re-introduce by scientists to balance the surge of the elk population. The elk ate the willow plains bare which made the bird population dwindle as they had no place to hunt for insects or hide from predators. The willow plains also provided shade for the rivers a...
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