1. Smithsonian Conservation Biology Institute, Virginia Working Landscapes, 1500 Remount RoadFront Royal VA 22630 USA
2. Smithsonian Conservation Biology Institute, Migratory Bird Center, 3001 Connecticut Avenue NWWashington DC 20008 USA
3. George Mason University, Biology Department, 4400 University Drive, MS 3E1Fairfax VA 22030 USA
4. Smithsonian Conservation Biology Institute, Conservation Ecology Center, 1500 Remount RoadFront Royal VA 22630 USA