Can Rouen ducks have yellow ducklings??

[Mundymae]

My Rouen duck just appeared with 12 ducklings, 3 of which are yellow. How is this possible? We have 2 other Khaki Campbell and more Rouins

 

[Pyxis]

Yes They will be white when they are fully grown. It means the mother and whichever drake is their father are both carrying white.

 

[Jecie]

Will they not have the trademark blue on their wings?? I have a yellow duckling that is supposed to be a rouhen.