1. Department of Evolutionary Biology and Environmental Studies University of Zürich Zürich Switzerland
2. Wild Nature Institute Concord NH USA
3. Department of Biology Pennsylvania State University University Park PA USA
4. Department of Collective Behavior Max Planck Institute of Animal Behavior Konstanz Germany
5. Department of Biology University of Konstanz Konstanz Germany
6. Center for the Advanced Study of Collective Behaviour University of Konstanz Konstanz Germany