1. Sex ratios of fledgling Golden Eagles and Jackrabbit densities;Arnold;Auk,1989
2. Bijlsma , S. Hagemeijer , E.J.M. Verkley , G.J.M. Zollinger , R. 1988 Ecological aspects of the Lesser Kestrel Falco naumanni in Extremadura (Spain). Rapport 285. Katholieke Universiteit Nijmegen, The Netherlands
3. Sex ratios of fledgling Golden Eagles;Bortolotti;Auk,1989
4. Adaptive seasonal variation in the sex ratio of kestrel broods;Dijkstra;Funct. Ecol.,1990