1. Department of Collective Behaviour, Max Planck Institute of Animal Behavior, 78464 Konstanz, Germany
2. Department of Biology, University of Konstanz, 78464 Konstanz, Germany
3. Centre for the Advanced Study of Collective Behaviour, University of Konstanz, 78464 Konstanz, Germany
4. School of Arts and Sciences, Ahmedabad University, 380009, Ahmedabad, Gujarat, India
5. Department of Mathematics and Computer Science, Freie Universität Berlin, 14195 Berlin, Germany
6. Department of Biological Sciences, Auburn University, 36849 Auburn AL, USA