I have had a bevy of Pekin ducks since they were very small and a couple of weeks old. In 2011 I lost onto a racoon and a year later one was found in her house dead but also with a big patch of feathers missing. I am now noticing that there seems to be one of them that is sitting on the back of another and either pruning it or picking on it. They are all females. Has anyone noticed this with your ducks?