Originally we had 6 male ducks and 4 females - or that's what we thought, anyway. In the past few months, one of our adult males had started making a funny noise- somewhere between the girl's quack and the boy's whisper ("Quaaah..." ). He didn't do it very much though. But today he was quacking just like the other girl ducks. He also continued whispering, alternating. He quacked very much, repeatedly today. Two people heard him, so it's not just me not hearing him right. I know that if they change gender they don't change all the way. So it seems like there are two possibilities: either he was a she all along- just whispering and with a drake feather (s/he still has a little one) or he is/was a he and is just a very "feminine" drake? I am hoping for the first option ( I want more eggs, and that would even the genders out). Is there any way I can tell, besides waiting to see if s/he lays an egg? Sometimes we have seen him picking up pieces of bedding and making a nest during the day. He always does this in a corner someplace, just like the girl ducks do. Then his friends, some other drakes, come over and stomp around in it, so he seems to give up after five minutes or so. We were positive he was a male, as he was one of the first to get a drake feather. Also he is one of the biggest ducks we have. He just looks like a drake, but he sounds and acts like a duck. We never vent-sexed however. We got him and the rest of the ducklings straight-run. The duck is about two years old, if that makes a difference. S/he is a Swedish blue Thanks!