Ok yes I know they should be easy to voice sex. I have been torn with this one since the get go. We started with 6 ducks total. 2 I knew for sure were girls. We’re down to 4 ducks. Of which I know 1 is definitely female. The other one has stumped me from the getgo. It will quack but doesn’t as much as the one that’s a girl (that is also much quieter than the girl we lost in May). I have seen the boys mate 1 and attempt to mate the other and Now I have seen the duck in question attempt to mate the one I know is a girl. Initially I was going to get rid of the boys but if we only have 1 girl she may be easier to rehome...they are 18 weeks old. Diamond (D) is the one in question.