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California Raptor Center, University of California, Davis
Whistler, a Swainson’s hawk, displays the intricate markings on the underside of its wings and tail, June 8 2017, California Raptor Center, University of California, Davis. The Swainson’s hawk is a regular visitor at Travis Air Force Base, Calif., often nesting on base. (U.S. Air Force photo/ Heide Couch)