Rouens are considered a heavy breed. Adult drakes (males) weigh 8 to 10 pounds and hens(females)weigh 7 to 9 pounds. Egg Color - Blue-green to near-white. Ducklings are black with two yellow stripes on their head, white on breast, black beak and feet. Rouens are brighter in colour than Mallards. Thank you to Kansaskid, 1234duck, and, Baralak for permission to use their photos.