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The Fascinating Story of Why U.S. Parks Are Full of Squirrels »

In most American cities, it's hard to walk through a park without spotting a gray squirrel. Those bushy-tailed little buggers are everywhere, chomping on nuts and climbing up trees--but not thanks to nature. No sir. They're there because we put them there to entertain us—among other things. Source Main page (current trends)
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