1. Department of Fisheries, Wildlife and Conservation Biology, University of Minnesota, St. Paul, Minnesota, USA
2. Natural Resources Research Institute, University of Minnesota, Duluth, Minnesota, USA
3. Swiss Ornithological Institute, Department of Bird Migration, Sempach, Switzerland
4. Department of Neurobiology, Physiology and Behavior, University of California, Davis, California, USA
5. Canadian Wildlife Service, Environment and Climate Change Canada, Burlington, Ontario, Canada
6. Canadian Wildlife Service, Saskatoon, Saskatchewan, Canada
7. Department of Natural Resources, Cornell University, Ithaca, New York, USA
8. Wisconsin Department of Natural Resources, Madison, Wisconsin, USA
9. Wisconsin Department of Natural Resources, Brule, Wisconsin, USA
10. Canadian Wildlife Service, Gatineau, Quebec, Canada