A golden eagle perches in Yellowstone National Park in Wyoming in this undated photo provided by the U.S. Fish and Wildlife Service. Researchers will turn their eyes to the treetops in Yellowstone ... more 
A golden eagle perches in Yellowstone National Park in Wyoming in this undated photo provided by the U.S. Fish and Wildlife Service. Researchers will turn their eyes to the treetops in Yellowstone National Park this spring, looking to establish a baseline count for the park’s raptor population and follow any changes for years to come. less 
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Associated Press | Photo By U.S. Fish and Wildlife Service, George Gentry
Tue, May 3, 2011 2:45 PM EDT