[Mystery bird] Rough-legged Hawk, Buteo lagopus, photographed on Fort Pierre National Grasslands in South Dakota. [I will identify this bird for you tomorrow]
Image: Terry Sohl, 4 January 2009 [larger view].
Photo taken with a Canon 50D, 400 5.6L.
Please name at least one field mark that supports your identification.
Review all mystery birds to date.