We have 3 drakes and 7 hens,all raised together. The drakes have just gone to greenheads. 5-7 months old. We have noticed one Drake being nasty to another yet seems to be fine with the third. This is to the point the bully drake will not let the other into the pool or the duck house. Is this normal behavior? My daughter say's she saw a drake mount a female however I have not seen this. Mallards are seasonal breeders correct??. Should I split these guys up and split females between them. We want breeders eventually. Thanks