I've noticed over the past week that my Muscovy's tail feathers are getting more and more frayed on her right side. Some feathers just have the middle vain left (what is that part called?). Her other feathers look fine. What could be causing this? Its just her and her Pekin friend in the backyard and they are in a pen at night. Is she doing this to herself or is the Pekin doing it to her? She has also started flying this week. Could that be it? It is getting worse so I don't think it was another animal attack.