1. Migratory Bird Center Smithsonian Conservation Biology Institute Washington D. C.20008USA
2. Graduate Program in Behavior, Ecology, Evolution, and Systematics University of Maryland College Park Maryland20742USA
3. Department of Biology and McCourt School of Public Policy Georgetown University 37th and O Streets NW Washington D. C.20057USA
4. Department of Natural Resource Management South Dakota State University Brookings South Dakota57007USA
5. Bird Conservancy of the Rockies 230 Cherry St, Suite 150 Fort Collins Colorado80521USA
6. Department of Entomology and Wildlife Ecology University of Delaware Newark Delaware19716USA
7. Tyson Research Center Washington University in St. Louis 6750 Tyson Valley Road Eureka Missouri63025USA