if the drake was introduced as an adult with the hens yes they will gang up on him. If they grew up with him they would not beat him up. This is usually the case when a new member is introduced into a flock. Best bet is to keep him seperate but within view so they can get accustomed to him b4 putting him back with them.I have five female muscovies and one male. I have begun to suspect the females are beating up the male. The feathers on the back of his neck are messed up and he didn't wnat to go in the greenhouse with the females tonight. My husband said that earlier the females were in the shelter in the garden and the male was standing alone outside. Do females decide to beat up the male? I guess I've always heard it the other way around.