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Aspen recovery in Yellowstone | by Oregon State University
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Aspen recovery in Yellowstone

Young aspen trees are now recovering in Yellowstone National Park, after wolves that were re-introduced in 1995 helped to limit elk browsing that had been killing young trees. The older trees seen here date to the last time there were wolves in the park 70 years ago. (Photo by William Ripple, courtesy of Oregon State University)

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Taken on September 8, 2010