Golden Gate National Parks Conservancy
Golden Gate National Recreation Area
Cavallo Point Lodge – Resort Hotel in the Marin Headlands
The Bird Group
Friends of the Swainson's Hawk
The Hungry Owl Project
The Santa Cruz Predatory Bird Research Group
Sky-Hunters.org
Birds of Prey Foundation
Boise State University Raptor Research Center
Canadian Peregrine Foundation
Ferruginous Hawk.org
Hanging Rock Raptor Observatory
Hawk Cliff Foundation
Hawk Migration Association of North America
Hawk Mountain Sanctuary
Hawkwatch International
Kite Site 2000
The Peregrine Fund
THE RAPTOR CENTER at University of Minnesota
Raptor Research Foundation
The Raptor Resource Project
Joe Morlan's California Birding Pages
PRBO Conservation Science
San Francisco Bay Bird Observatory
California Birding Lists Digest
Top 7 Birding Areas in Marin County, California
Birding Pal
Great Basin Bird Observatory
Migration Research Foundation
Ornithology.com
Virtual Birder
What Bird
