Rank and reproduction in cooperatively breeding African wild dogs: behavioral and endocrine correlates

Scott Creel,*’ Nancy Marusha Creel,«* Michael G. L. Mffls, and Steven L. Monfort •Field Research Center for Ecology and Ethology, Rockefeller University, Box 38B RR2, Millbrook, NY 12545, USA, Selous Wild Dog Project, Frankfurt Zoological Society, % SCP, Box 1519, Dar es Salaam, Tanzania, ‘Private Bag X-402, Kruger National Park, Skukuza, 1350, South Africa, and ••Department of Reproductive Physiology, Conservation and Research Center, National Zoological Park, Front Royal, VA 22630, USA