Hmmm, maybe this experiment will not work. They are in a normal color change at the moment, and although they are looking better, it may very well be the change of season :/
How is she looking now? Any bettter?
I feel like as my mallards have aged, they have gotten a bit less colorful, and I have had the same question. Have you been deworming her? I am trying to determine if color loss might be due to a buildup of parasites as mine have never been dewormed and are 6.5 years old. I am actually getting...