You don't happen to have any really bossy female ducks, do you? One of my female Rouens is a very dominant duck. When I had a dominant drake, she backed off and got submissive, although she wouldn't let him mate her. But when I got rid of him, she took charge again. She will sometimes even chase off the drake I do have, when he tries to mate with the other females. And he knows better than to try to mate with her, she won't allow it.