1. School of Biological Sciences, University of Nebraska—Lincoln, 1101T Street, Lincoln, NE 68588, USA
2. Department of Biology, Syracuse University, 107 College Place, Syracuse, NY 13244, USA
3. Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
4. Dept of Ecology and Evolutionary Biology, Princeton University, 106A Guyot Hall, Princeton, NJ 08544, USA
5. Biology Department, University of Konstanz, Universitätsstrasse 10, 78464 Konstanz, Germany
6. Centre for the Advanced Study of Collective Behaviour, University of Konstanz, Universitätsstrasse 10, 78464 Konstanz, Germany
7. Department for the Ecology of Animal Societies, Max Planck Institute of Animal Behaviour, Bücklestrasse 5a, 78467 Konstanz, Germany
8. Department of Integrative Biology, Michigan State University, 288 Farm Lane, East Lansing, MI 48824 USA
9. Ecology, Evolution, and Behavior Program, Michigan State University, 293 Farm Lane, East Lansing, MI 48824, USA