1. Department of Anthropology University of Wisconsin–Madison Madison Wisconsin USA
2. Brain Function Research Group, School of Physiology, Faculty of Health Science University of the Witwatersrand Johannesburg South Africa
3. Department of Psychology University of Lethbridge Lethbridge Canada
4. School of Animal, Plant and Environmental Sciences, Faculty of Science University of the Witwatersrand Johannesburg South Africa
5. Department of Integrative Biology University of Wisconsin–Madison Madison Wisconsin USA
6. Applied Behavioural Ecology & Ecosystems Research Unit University of South Africa Pretoria South Africa
7. Endocrine Research Laboratory, Mammal Research Institute, Faculty of Natural and Agricultural Science University of Pretoria Pretoria South Africa