Wikipedia:Picture of the day/October 18, 2006
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A domesticated Swan Goose (Anser cygnoides) with a "knob" (found in some variations) above its beak. This knob is more prominent on males than on females and can be used for sexing by 6–8 weeks of age. Wild Swan Geese can be found in Mongolia and eastern Russia. They are migratory and winter mostly in south and east China. Photo credit: Alan D. Wilson |