rouen. mallards have one eye stripe and rouens have two. i figured that out on my own when i bought 2 "mallards" lol one is a rouen, but i've ben told a rouen cross.
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my rouens produced mainly single eye stripe chicks, out of 11, two had double stripes. You can't always go by the markings. That said, I've never seen a mallard chick with doubles.