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Never heard of a silver crested? My other white duck I have was to have orange feet and orange beak and be pure white but her beak turned black and he feathers are the same color as the crested!
Like many fowl, they do not breed true in the Blue form, so that out of a breeding of 2 Blues you will get 50 percent Blue, 25 percent Black and 25 percent Silver or Splash.
I have 4 swedish blue mixes, one is blue, one is black, one is yellowish (silver?) and one is yellowish with grey on the shoulders (splash?)... your white ones look a LOT like my yellow ones!!!