1. Department of Behavioral and Cognitive Biology, Faculty of Life Sciences University of Vienna Vienna Austria
2. Department of Biology, Behavioral Ecology and Ecophysiology University of Antwerp Wilrijk Belgium
3. SALTO, Agro‐ and Biotechnology Odisee University College Brussels Belgium
4. Department of Human Evolution Max Planck Institute for Evolutionary Anthropology Leipzig Germany
5. Interim Group Primatology Max Planck Institute for Evolutionary Anthropology Leipzig Germany
6. Endocrinology Laboratory, German Primate Center Leibniz Institute for Primate Research Göttingen Germany