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Aspen trees tower over brush in Yellowstone National Park on September 16, 2009. Researchers have now documented the first aspens to join the overstory canopy layer in Yellowstone’s northern range in 80 years, three decades after wolves were reintroduced to the nation’s oldest national park.
Luke Painter
/
OSU College of Agricultural Sciences
For the first time since the 1940s, new aspens have joined the forest canopy in Yellowstone National Park. Researchers say that wouldn’t have happened without wolves.
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