1. Junior Research Group of Primate Kin Selection; Department of Primatology; Max-Planck Institute for Evolutionary Anthropology; Deutscher Platz 6 04103 Leipzig Germany
2. Institute of Biology; Faculty of Bioscience; Pharmacy and Psychology; University of Leipzig; Talstrasse 33 04103 Leipzig Germany
3. Max-Planck Institute for Evolutionary Anthropology; Deutscher Platz 6 04103 Leipzig Germany