Study: Red squirrels cause evolutionary change

July 5, 2014 6:38 PM

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CASPER, Wyo. (AP) — When most people think about Yellowstone National Park and animals, the big ones come to mind: bison, wolves or grizzly bears.

They're the species that draw tourists from around the globe. They're also the ones that raise controversy and debate. But when it comes to actual impact on the forest, scientists recently discovered a much smaller, much more common creature is causing large, evolutionary changes to the park: the re...

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