well I think what makes it different from albino is the fact that it only partially affects the pigment in skin, hair, feathers. Albino would be all pigment and would have pink eyes.That sounds like it could be right, but her bill is a darker color and her feet are bright yellow... maybe it's just not effecting those areas? Or maybe she's a completely different breed.?
Or it could be a different breed entirely or something else was mixed in along the line. I have never heard of White Cayuga ducks for sale.. but there's always a first time for everything
