1. Division of Birds, Negaunee Integrative Research Center, Chicago, IL, USA
2. Faculty of Natural Sciences, Imperial College London Silwood Park, Ascot, UK
3. Biological Sciences Division, The College at University of Chicago, Chicago, IL, USA
4. Department of Biology, University of Oklahoma, Norman, OK, USA
5. Biodiversity Research Centre and Department of Zoology, University of British Columbia, Vancouver, BC, Canada
6. Department of Environmental Biology, State University of New York College of Environmental Science and Forestry, Syracuse, NY, USA
7. School of Environment and Natural Resources, Ohio State University, Columbus, OH, USA
8. Departamento de Ciencias Biológicas, Universidad EAFIT, Medellín, Colombia
9. BirdsCaribbean, Natick, MA, USA
10. Department of Biology, Villanova University, Villanova, PA, USA
11. Biodiversity Institute & Natural History Museum, University of Kansas, Lawrence, KS, USA
12. Committee on Evolutionary Biology, University of Chicago, Chicago, IL, USA