33 



Schmutz, J. K. , R. W. Fyfe, D. A. Moore, and A. R. Smith. 



1984. Artificial nests for ferruginous and Swainson's 



hawks. J. Wildl. Manage. 48:1009-1013. 

 Smith, D. G. and J. R. Murphy. 1982. Nest site selection 



in raptor communities of the eastern Great Basin. 



Great Basin Natur. 42:395-404. 

 Wittenhagen, K. W. 1991. 1991 progress report on the 



ferruginous hawk in southeastern Montana. Unpubl. Rep. 



U.S. Bur. Land Manage., Miles City, MT. 24 pp. 

 Woffinden, N. D. 1975. Ecology of the ferruginous hawk 



(Buteo regalis) in central Utah: population dynamics 



ad nest site selection. MS. thesis. Brigham Young 



Univ. , Provo, Utah. 102 pp. 

 Woffinden, N. D. and J. R. Murphy. 1989. Decline of a 



ferruginous hawk population: A 20-year summary. J. 



Wildl. Manage. 53:1127-1132. 

 Ure, J., P. Briggs, and S. W. Hoffman. 1991. Petition to 



list as endangered the ferruginous hawk ( Buteo 



reqalis ) , as provided by the Endangered Species Act of 



197 3, as amended in 1982. Ferruginous Hawk Project, 



Salt Lake City, Utah. 9 pp. 

 U.S. Fish and Wildlife Service. 1992. Endangered and 



threatened wildlife and plants; notice of finding on 



petition to list the ferruginous hawk. Federal 



Register 57 (161) : 37507-37513 . August 19, 1992. 



