1. Cornell Lab of Ornithology Cornell University Ithaca New York
2. Edward Grey Institute, Department of Zoology University of Oxford Oxford UK
3. Migratory Bird Center, Smithsonian Conservation Biology Institute National Zoological Park Washington District of Columbia
4. Department of Entomology and Wildlife Ecology University of Delaware Newark Delaware
5. Department of Biology University of Oklahoma Norman Oklahoma
6. Corix Plains Institute University of Oklahoma Norman Oklahoma