Hi ... I have 2 pekin ducks about 6 months old bought at the same time from the same batch of ducklings. I'm trying to figure out if I have 2 males or a male and a female. I've been reading a lot on this topic and both appear to have raspy quacks, not a crisp, clear quack from either and they aren't noisy at all. Both free range all day with my 7 hens and rooster and there aren't any dominance issues at all with the other chickens, in fact they are very submissive to the chickens, which works out great. One of the ducks, the smaller one, definitely has the curled feather in back, the other one, which is larger, definitey does not have this curly feather. Is this curly feather the determining factor here? They are very affectionate with each other and cuddle all day with each other. It's really cute too because the apparent male kisses the other one and rubs bills as if they are kissing, it's really cute. Do you think I have both males, but the other one hasn't developed the curly feather as yet? Can I have a potential female with a raspy quack?