We recently had a horrific event where our dog killed our two female call ducks which left the drake alone. I bought two mature female call ducks to keep him company and he has accepted one just fine but he chases the other female off. Why is this? I feel so sorry for the female as she follows them at a distance but is always an outsider. I've heard of this with multiple drakes in one flock but never the female. Should I get another female duck to add to the flock or wont that help?