Yosemites Unique Owls

  In this July 2012 photo released by the National Park Service, two juvenile Great Gray Owls are shown on a tree branch in Yosemite National Park. The unique Great Gray Owls of Yosemite National Park, left to evolve after glacial ice separated them from their plentiful Canadian brethren 30 millennia ago, are both a mystery and concern to the scientists charged with protecting them. (AP Photo/National Park Service)
In this July 2012 photo released by the National Park Service, two juvenile Great Gray Owls are shown on a tree branch in Yosemite National Park. The unique Great Gray Owls of Yosemite National Park, left to evolve after glacial ice separated them from their plentiful Canadian brethren 30 millennia ago, are both a mystery and concern to the scientists charged with protecting them. (AP Photo/National Park Service)

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