白色型成鳥 © Marshall Iliff eBird S41596010 Macaulay Library ML 83984151
藍色型成鳥 © Brooke Miller
白色型幼鳥 © Blake Matheson
白色型成鳥 © Ronan Nicholson
白色型成鳥 © Marky Mutchler
+ 4
白色型成鳥 © Brian Sullivan
白色型成鳥 (with Snow Goose) © Patrice St-Pierre
白色型成鳥 (with Canada Goose and Cackling Goose) © Max Leibowitz

Ross's Goose Anser rossii

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辨識

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Cute miniature version of Snow Goose with smaller body, shorter neck, and stubbier bill. Pay special attention to the bill: short, with a straighter border where it meets the face, a much less obvious dark “grin patch,” and often bluish-gray color at the base. Also note clean white head; Snow Goose typically has yellowish staining on face. Hybrids with Snow Goose are rare but regular; some intermediates might be best left unidentified. Dark morph Ross’s is extremely rare. Typically found in flocks, but individuals may be found with other geese species. Frequently in large mixed flocks with Snow Geese. Occurs in fields, marshes, and lakes during migration and winter; breeds on Arctic tundra.

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