Agreed, unfortunatly, once ducks decide that someone is not cool, than that's it. I think that there are alot of factors that can play into it, in particular love of a one particular female over another. I have 5 males and 5 females right now (4 are becoming roast duck on Sunday) and they are actually all functioning pretty well, however when there is a fight it is between 2 of the males over one particular female...like oh wow an episode of Jerry Springducker in my backyard.
LOL Jerry Springducker I must have missed that one..