1. Department of Ecology, Evolution and Marine Biology, University of California – Santa Barbara, Santa Barbara, CA 93106, USA
2. Department of Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Ontario L8S 4K1, Canada
3. School of Aquatic and Fisheries Sciences, University of Washington, Seattle, WA 98195, USA
4. Santa Fe Institute, Santa Fe, NM 87501, USA
5. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA
6. Department of Ecology and Evolutionary Biology, University of California – Los Angeles, Los Angeles, CA 90095, USA
7. Department of Biology, University of Nevada – Reno, Reno, NV 89557, USA
8. Edward Grey Institute of Field Ornithology, Department of Zoology, University of Oxford, Oxford OX1 3PS, UK
9. Cognitive and Cultural Ecology Research Group, Max Planck Institute of Ornithology, Radolfzell, 78315, Germany
10. Department of Biology, University of York, Heslington, York YO10 5DD, UK
11. School of Human Evolution and Social Change, and Institute of Human Origins, Arizona State University, Tempe, AZ 85287, USA
12. Department of Anthropology, University of California Davis, Davis, CA 95616, USA