1. Department of Biology University of Konstanz Constance Germany
2. Department of Collective Behaviour Max Planck Institute of Animal Behavior Radolfzell Germany
3. Department of Evolutionary Biology and Environmental Studies University of Zurich Zurich Switzerland
4. Centre for the Advanced Study of Collective Behaviour Universität Konstanz Constance Germany
5. Cognitive and Cultural Ecology Research Group Max Planck Institute of Animal Behavior Radolfzell Germany
6. Division of Ecology and Evolution, Research School of Biology Australian National University Canberra Australian Capital Territory Australia