Hi I have three muscovy ducks (a drake and two hens) and two chickens (a silver wyandotte and probably a buff orpington). Got the ducklings in early july and the two older chickens in september. Of course the ducks were supposed to be all girls but I love them to much to get rid of my boy.
That was a few months ago I then got two more muscovies (a drake and a hen) in october and another muscovy (hen) in December. That is Duck/Chicken math for you