A = Harlan's Red-tailed Hawk

B = Ferruginous Hawk, dark morph

Our favorite references for identifying raptors are:

A Photographic Guide to North American Raptors by Brian Wheeler and Bill Clark, Academic Press

A Field Guide to Hawks (Peterson Field Guide Series) by Bill Clark and Brian Wheeler, Houghton Mifflin

Also, a new edition of the classic Hawks in Flight by Pete Dunne, Clay Sutton, and David Sibley is in the works.

For more help with raptor identification, SABO offers workshops and "Hawk Stalks" each winter.