Hi everyone, We have had a set of Muscovy hens for over a year. They have always been best friends and are always together but recently one hen has become very aggressive to the other one. She has started pulling out the neck feathers of our more passive hen and is also staying inside the coop more often (they have free roam of our property during the day) and is scared of us when she never used to be. She doesn't have any eggs, so I'm not sure why she's staying inside. Any advice on why she's all of a sudden being aggressive? And anything I can do about it? Thanks!!!