Four Quackers and a Mystery

Which are drakes, and which are ducks?  Which are Golden?I'm placing bets that we have four females, with one other still undetermined.  Four of the Welsh Harlequins have begun to quack, the feathers on their wings and sides are all a little lighter than the others, and their bills are a bit darker.  We'll have a better idea as time goes on, but that's my best guess right now.  Four layers will be good--we wanted at least three.  Of the two Goldens, I think one is a drak ...