African Bird Club
American Bird Conservacy
American Birding Association
American Federation of Aviculture
American Ornithologists' Union
Asociación Colombiana de Ornitología
Association of Avian Veterinarians
Association of Field Ornithologists
Australasian Raptor Association
Australian Bird Study Association
Avicultural Society
Avicultural Society of America
Belize Audubon Society
BirdLife International
British Ornithologists' Union
British Trust for Ornithology
China Ornithological Society
Cooper Ornithological Society
Dutch Birding Association
European Ornithologists' Union
HawkWatch International
Hellenic Ornithological Society
International Ornithological Committee
National Audubon Society
National Finch and Softbill Society
North American Bluebird Society
Neotropical Bird Club
Organization of Professional Aviculturists
Oriental Bird Club
Ornithological Council
Ornithological Societies of North America
Ornithological Society of Japan
Ornithological Society of New Zealand
Ornithological Society of Polynesia
Ornithological Society of the Middle East
Pacific Seabird Group
Raptor Research Foundation
Royal Australasian Ornithologists Union
Sociedad Antioqueña de Ornitología
Sociedad de Ornitología Neotropical
Society for the Conservation and Study of Caribbean Birds
Society of Avian Paleontology and Evolution
Society of Canadian Ornithologists
Waterbird Society
West African Ornithological Society
Wild Bird Society of Japan
Wilson Ornithological Society