UNITED STATES DEPARTMENT OF THE INTERIOR 
Fish and Wildlife Service 
Bureau of Sport Fisheries and Wildlife 
SEX DETERMINATION OF EAGLES, OWLS, AND HERONS 
BY ANALYZING PLASMA STEROID HORMONES 
By 
Michael P. Dieter 
Patuxent Wildlife Research Center 
Division of Wildlife Research 
Bureau of Sport Fisheries and Wildlife 
Laurel, Maryland 20810 

Bureau of Sport Fisheries and Wildlife 
Special Scientific Report--Wildlife No. 167 
Washington, D.C. °* May 1973 
NWAC Research Libra Library 
WNIT Rreraeeroatt 
HII National Wildlife Research Center 
90017835 Fort Collins, CO 80521-2154 
