Hi, I have 6 little 5 week old rouens, this are my first ducks so I dont know much about ducks, so my question is, I was outside today watering my back yard and the ducks came up tome, there starting to get their real feathers in but I notice thats there about three of them that on their heads you can see some green feathers shining through, My question is, is this normal? Do all rouen ducklins get this or is it just the males? I try taking pictures but the greenish wouldnt show on the pics, ( crappy camera phone) thanks in advance.