J. F. Gmelin, 1789,
Breeds in W North America from Alaska and Canada (British Columbia E to Manitoba) S to Baja California and C Mexico; also scattered in NE from Canadian border in Great Lakes region to the Carolinas, E USA; West Indies. Winters from SW British Columbia through S USA S to El Salvador.
Escaped from captivity and became established in England, from where has spread to many other countries of Europe, N Africa and Middle East; eradication programme underway in some countries following interbreeding with globally threatened O. leucocephala.
Food and feeding
Status and conservation
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