Why would a black duck start growing white feathers?

UbDucks

In the Brooder
6 Years
Jan 1, 2014
16
0
22
Just curious if anyone has heard of this. Runner female, all black, at around age two started growing white patches. First just a few feathers, now lots of white. Has been happening for about a year.
 
My two year old Muscovy hens were completely black when I got them at 6 months or so. They now have a white on their wings. It is pretty cool looking. I am assuming that they will get even whiter as they age.
 

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