Hi, I have 7 indian runners and my drake constantly attacks this one old female that isn't so good on her feet and is just really frail in general. She always runs, sometimes they will mate and others he will sit on top of her then get off again or just peck her neck a lot to the point where she sits alone in the duck house for hours. Is there a way I can stop this or make it less worse? We can't afford two duck houses so separating is quite hard and I don't like seeing them depressed on their own. My drake is just under a year old and we are currently in the summer.