1. Behavioural Ecology, Institute of Biology, Faculty of Life Sciences, Leipzig University, Talstr, Leipzig, Germany
2. Research Group Primate Kin Selection, Department of Primatology, Max-Planck-Institute for Evolutionary Anthropology, Deutscher Platz, Leipzig, Germany
3. Applied Behavioural Ecology and Ecosystems Research Unit, University of South Africa, Christiaan de Wet Road and Pioneer Avenue, Florida, Gauteng, South Africa
4. Department of Anatomy and Physiology, Faculty of Veterinary Science, University of Pretoria, Private Bag, Onderstepoort, South Africa
5. Department of Psychology, University of Lethbridge, 4401 University Drive, Lethbridge, AB, Canada
6. Department of Anthropology, University of Wisconsin–Madison, 1180 Observatory Drive, Madison, WI, USA
7. Brain Function Research Group, School of Physiology, University of the Witwatersrand, Parktown, Johannesburg, Gauteng, South Africa
8. and Department of Genetics, Faculty of Natural and Agricultural Sciences, University of the Free State, Nelson Mandela Drive, Park West, Bloemfontein, South Africa