Hello! Seasoned backyard chicken-owner, here, but our first time raising ducks. We purchased one Blue Swedish, two fawn/white Indian Runners, and two Magpie ducks this spring; all seven weeks old now. Not old enough for drake feathers or eggs, yet. Noticing that the magpies have developed some iridescent beetle-green/purple mixed with the black on their caps/backs/wings. The one with less white is more iridescent. Wondering if this suggests they are drakes, mixed-breeds (supposed to be pure), or just poor example of breed standard? No luck finding info about this specific color trait under breed regulations. I also notice they don't have as much white as most breed info pics, but perhaps will change as they continue to mature? This breed is apparently very difficult to breed to standard. Mostly just curious, especially about how many drakes we've ended up with.