I know you are asking @Isadora , but my pilgrim killed a couple of chickens, and have cornered a few duck hens. The females and the male was involved, so you need to be prepared for aggression even from the females towards other birds.Yes it would be aggression I am worried about, because I have little brothers. My Muscovies aren't aggressive I guess I lucked out because my male muscovy is a sweetheart, and its breeding season right now, I handled my Muscovies as babies and they aren't aggressive. I know that male geese are aggressive during breeding season, are female geese aggressive during breeding season?