We have 3 runner ducks, a male and two female. They are not very social with us, which has been a great disappointment since our last ducks (Pekins) were quite social. We are considering getting 2 more to add to the duck flock. We are considering gettin a different breed though. Can we mix a new breed with the runners? I'm looking at a couple of sweet little call ducks, but am worried that the male runner with try to mate with them and perhaps injure them. We are also thinking maybe two pekins, but we would rather get a set of duck we already know to be female (the call ducks are full grown) than to add immature pekin (would have to be ducklings) risking another male in the flock... Any thoughts or suggestions? Is it very difficult to incorporate new members to a flock of ducks? Our current flock is around 6 to 8 months old.