They all look feminine to me.... do any of them have big crests? My male has a much larger crest than my girls.my drake turned to be a girl as I saw her laying an egg. another one is laying eggs at night so I don't know which one. I have just cracked 1 duck's egg and it seems to be fertilized. so, which one is a boy:
this one
or this one
the black head one is about 9 months old and the white one should be 1 - 1,5 month older.
this one is laying eggs: