I've got two male ducks, they are both about 7 months old now. the question is this, why do they chase down my columbian wyandotte hen and pluck out her butt feathers!! I've got one female pekin which they bother all the time. they just torment my poor little girl so much, that I always bring her inside. Any suggestions on how to remedy this problem, or do you think that I should just find them a new home ?