Ok, so my 6 ducks have been together since the day they hatched...there are 3 females and 3 males. Anyway, lately I've noticed that the two pekin males will chase the black Swedish male around! One time I came home and the pekin had the black swedish's neck in his mouth (or bill)! Why is this starting to happen? Is it the while dominance thing? How can I stop it? I'm worried something very serious could happen if it isn't stopped thanks!