American Ornithologists' Union was created in 1883.
Royal Australasian Ornithologists Union was created in 1901.
Canberra Ornithologists Group was created in 1970.
Adelaide Ornithologists Club was created in 1960.
Scottish Ornithologists' Club was created in 1936.
Association of Field Ornithologists was created in 1922.
Society of Canadian Ornithologists was created in 1983.
NSW Field Ornithologists Club was created in 1970.
Great auk
American Art-Union was created in 1839.
American Conservative Union was created in 1964.
American Geophysical Union was created in 1919.
American Labor Union was created in 1902.