I have two six-week-old Pekin/Mallards, the larger and squeakier one I have always assumed to be male and the smaller mostly black with quacker to be female. Over the last week the assumed female's head has begun to turn green as has the small patch of black on the male's head. I'm waiting for the drake feathers to show up but until then, what do y'all think? Trying to upload a pic so you can see their bills as well but with the new iPhone update it won't allow me? His bill is orange and her's is black. AND she's SUPER quacky!