1. Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark
2. Louisiana State University Museum of Natural Science and Department of Biological Sciences, Baton Rouge, Louisiana, USA
3. Cornell Lab of Ornithology, Cornell University, Ithaca, New York, USA
4. University of Kansas Biodiversity Research Institute, Lawrence, Kansas, USA
5. Division of Birds, Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA
6. Center for Macroecology, Evolution, and Climate, University of Copenhagen, Copenhagen, Denmark
7. American Bird Conservancy, The Plains, Virginia, USA
8. Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, New Mexico, USA
9. Laboratorio de Biología Evolutiva de Vertebrados, Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia
10. CORBIDI, Surco, Lima, Peru
11. Universidad Nacional Agraria La Molina, Faculty of Forestry Sciences, Lima, Peru