I have 4 ducks, 2 female Pekins, 1 female Rouen, and 1 Rouen drake.They are all about 4 1/2 months old. For some reason, when they all go swimming, the Rouen female constantly picks out the feathers from my Jumbo Pekin girl's breast. The weird thing is that the Pekin doesn't even try to stop her. I wouldn't be concerned except that I am starting to see it looking a little bare there now. Why is she doing this just to the one, and why doesn't the other one fight back or at least protest? Any ideas?? I only notice that she does it when they swim and other than that, they all seem to get along fine. Like I said, I didn't really give it much thought until I noticed that it was starting to look like a bare area there.