Snowy
A variant of Call Duck (Anas platyrhynchos domesticus)
Representative Call Duckphoto — a dedicated image of this exact morph isn't available yet.
A frosted pattern with dark back and head markings over a pale ground, sometimes called 'snowy mallard'.
Keeper tips for this variant
Sexes differ strongly in snowy — keep a clearly marked pair so you can tell hens (more contrast) from drakes at moult time.