Presence of wolves allows aspen recovery in Yellowstone

The wolves are back, and for the first time in more than 50 years, young aspen trees are growing again in the northern range of Yellowstone National Park.

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<p><a href="http://www.physorg.com/news104684495.html">Presence of wolves allows aspen recovery in Yellowstone</a></p> <p>The wolves are back, and for the first time in more than 50 years, young aspen trees are growing again in the northern range of Yellowstone National Park.</p>