1. National Audubon Society, 545 Almshouse Road, Ivyland, PA 18974, USA
2. Pesticides and Birds Program, American Bird Conservancy, 1731 Connecticut Avenue, NW Washington, DC 20009, USA
3. Field Veterinary Program, Wildlife Conservation Society, 2300 Southern Boulevard, Bronx, NY 10460, USA
4. Smithsonian Migratory Bird Center, National Zoological Park, 3001 Connecticut Avenue, NW Washington, DC 20008, USA
5. Ornithological Council, 1707 H Street, NW Washington, DC 20006, USA