1. Department of Biology University of Konstanz Konstanz Germany
2. Department of Sociobiology/Anthropology University of Göttingen Göttingen Germany
3. Behavioral Ecology & Sociobiology Unit German Primate Center Göttingen Germany
4. Department of Collective Behaviour Max Planck Institute for Animal Behavior Konstanz Germany
5. Center for the Advanced Study of Collective Behaviour University of Konstanz Konstanz Germany