Swedish Yellow Duck

The duck is the descendant of Swedish blue duck; however,  the plumage is different to its ancestors. The duck is yellow brown in color. The hen shows consistently uniform in color. The hen bill is brownish blue but the drake is greenish-blue in color.
 The breed is a rarely duck breed. People though the bird had been extinct. Only a farm in Bilinge, still keeps the yellow duck. The Swedish Yellow is believed as Khaki Campbell Duck and Blue Swedish duck. It has been introduced first in 1920.
The Swedish yellow duck (Svenk Gul Anka) is different to its ancestor the blue; due it is not a good meat producer. However, the duck is a better layer than its ancestor.
Perhaps the yellow is a selective breed of Swedish blue that lays more eggs. The duck is also large, weighing 7.5 to 8.5 pound (3.5 to 4 kgs).
source:
http://www.ehow.com/facts_5936317_information-yellow-ducks.html