1. Behavioral Ecology and Sociobiology Unit, German Primate Center, Leibniz Institute for Primatology, Göttingen, Germany
2. Leibniz ScienceCampus ‘Primate Cognition’, Göttingen, Germany
3. Department of Sociobiology/Anthropology, Johann-Friedrich-Blumenbach Institute of Zoology and Anthropology, Georg-August-University Göttingen, Göttingen, Germany