Sauer, J.R., B.G. Peterjohn, S. Schwartz, and J.E. Hines. 1995. Ferrugionous Hawk Species Account. The Grassland Bird Home Page. Version 95.0 U.S.G.S. Biological Resource Division, Patuxent Wildlife Research Center, Laurel, MD. Online. Available: http://w

• Buteo regalis