1. U.S. Geological Survey Forest and Rangeland Ecosystem Science Center Boise Idaho USA
2. U.S. Fish and Wildlife Service, Division of Migratory Birds Management Denver Federal Center Denver Colorado USA
3. Eagle Environmental, Inc. Santa Fe New Mexico USA
4. Teton Raptor Center Wilson Wyoming USA
5. East Bay Regional Park District Oakland California USA
6. Wildlife Research Institute, Inc. Julian California USA
7. Bloom Research Inc. Santa Ana California USA
8. Craighead Beringia South Kelly Wyoming USA
9. Raptor View Research Institute Missoula Montana USA
10. U.S. Geological Survey Western Ecological Research Center San Diego California USA
11. U.S. Geological Survey Forest and Rangeland Ecosystem Science Center Corvallis Oregon USA
12. HawkWatch International Salt Lake City Utah USA
13. Washington Department of Fish and Wildlife Olympia Washington USA