Species concept | American Ornithologists' Union 1st edition (1886) | American Ornithologists' Union 2nd edition (1895) | American Ornithologists' Union 3rd edition (1910) | American Ornithologists' Union 4th edition (1931) | American Ornithologists' Union 5th edition (1957) | American Ornithologists' Union 6th edition (1983) | American Ornithologists' Union 7th edition (1998) | American Ornithologists' Society 7th edition (incl. 62nd suppl.) |
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Cygnus [columbianus or bewickii]← | |
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Cygnus columbianus Tundra Swan |
Cygnus columbianus Tundra Swan |
Cygnus columbianus Tundra Swan |
* Cygnus columbianus | Olor columbianus Whistling Swan |
Olor columbianus Whistling Swan |
Olor columbianus Whistling Swan |
Cygnus columbianus Whistling Swan |
Olor columbianus Whistling Swan |
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* Cygnus bewickii | |
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Cygnus bewickii (bewickii) | |
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[Cygnus bewickii (jankowskyi)] | |
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