Article: Annual counting birds of prey a Grand Canyon experience. (Originated from Arizona Republic)

GRAND CANYON NATIONAL PARK, Ariz. _ Perched on the edge of a 500-foot cliff, Daniel Perry clutches his binoculars as he scans the skies over the Grand Canyon for approaching birds of prey. 
Up from the depths of the canyon, dark specks zip past Lipan Point, crossing a landscape that runs from the rapids of the Colorado River, a mile below, to the cloud-shrouded San Francisco Peaks, 50 miles to the south. 
Perry's trained eyes, which once blurred over computer screens at a West Virginia curtain factory, now define the subtle curves and angles of each new silhouette. 
``It's a red-tailed hawk. There, just above the jet stream,'' Perry almost whispers, speaking in the ...

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