White-headed Duck misidentified as Ruddy Duck

I believe that the bird depicted in plate 3 (Brit. Birds 75: 9) is a female White-headed Duck Oxyura leucocephala and not a female Ruddy Duck O. jamaicensis. We breed these two species here at Arundel, so I am very familiar with them. In the photograph, the most noticeable characteristics are the swollen area of the bill above the nostrils, and the

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