1. Santa Fe Institute, Santa Fe, NM 87501, USA
2. School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195, USA
3. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
4. Department of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, 78315 Radolfzell, Germany
5. Department of Biology, University of Konstanz, 78457 Konstanz, Germany
6. Department of Fisheries, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
7. Department of Mathematical Sciences, University of Essex, Colchester, CO4 3SQ, UK
8. Department of Collective Behaviour, Max Planck Institute for Ornithology, Konstanz, Germany
9. Chair of Biodiversity and Collective Behaviour, University of Konstanz, 78457 Konstanz, Germany
10. National Great Rivers Research and Education Center, Alton, IL 62024, USA
11. Department of Biology, Washington University in St Louis, St Louis, MO 63130, USA
12. Department of Zoology, University of Oxford, Oxford OX1 3PS, UK