1. Behavioral Ecology and Sociobiology Unit, German Primate Center, Leibniz Institute for Primate Research, Kellnerweg 4, Göttingen 37077, Germany
2. Leibniz-ScienceCampus Primate Cognition, Kellnerweg 4, 37077 Göttingen, Germany
3. Department Anthropology/Sociobiology, University of Göttingen, Kellnerweg 6, 37077 Göttingen, Germany