About a month ago a young male mallard flew into my duck lot and decided my ducks were his new "group". Well I have 2 females and 2 male blue swedish ducks, 3 months old. At first they all got along great. Now it seems the 4 ducks are shunning the mallard. They won't let him in the pool and chase him away from their group. I feel really bad for him. Do I need to find him a female mallard duck or will they calm down?