We have 5 female ducks (4 runners, one Pekin) and one Pekin drake. We free range them and fill a kiddie pool up for them each day. In addition to thier foraging, we give them layer feed with added Brewers yeast. I left 6 healthy, happy ducks in the morning. I came home to one duck hobbling around on one foot. On closer inspection, she was missing almost all her tail feathers. I found them in a clump a few dozen yards from where I found her. The other five ducks were happily going on with life. I thought it must have been some daytime predator attack but there were no bite marks or wounds. Just a bloody rump with very few feathers. I put all the ducks in thier covered run and left them there for the next day. When I came home the second day, she had even fewer feathers than before. Her rump is plucked clean and she is still favoring the one leg. Since they were protected all day, I'm thinking that it must be one or more of the other ducks picking on her. I didn't think ducks had pecking orders like chickens, though! We created a separate enclosure for her in the garage to give her a chance to recover alone. She is listless and uncharacteristically quiet. Any ideas what might be going on? Would the other ducks really rip out CLUMPS of feathers like this? If so, why is it happening and what to do about it? Thanks in advance. This forum is a lifesaver.