1. Department of Biology, Regis University , Denver, Colorado , USA
2. Department of Ecology, Evolution and Behavior, University of Minnesota , St. Paul, Minnesota , USA
3. Bell Museum, University of Minnesota , St. Paul, Minnesota , USA
4. Colección Nacional de Aves, Departamento de Zoología, Instituto de Biología, Universidad Nacional Autónoma de México , Ciudad de México , México
5. Colegio de Ciencias Biológicas y Ambientales, Universidad San Francisco de Quito , Diego de Robles y Pampite, Quito , Ecuador
6. Department of Biology, San Francisco State University , San Francisco, California , USA
7. Department of Zoology, Denver Museum of Nature and Science , Denver, Colorado , USA
8. Department of Biology, University of Washington , Seattle, Washington , USA
9. Burke Museum of Natural History and Culture, University of Washington , Seattle, Washington , USA