Hello, I'm quite new to raising ducks. I have two cayugas (one male, one female), a mallard (male), and a pekin (female). The cayugas and mallard (Pancake, Waffles, and Bacon) have grown up together and are about 18-19 weeks old. Since we knew that the male to female ratio was going to be hard on Pancake (the female cayuga), we just adopted our pekin Muffin (5 months old) yesterday to at least make the numbers even. While in hindsight we should have introduced Muffin to the others much more gradually, she has already joined them and interrupted their pecking order. The dominant male, our mallard Bacon, has been antagonizing her ever since. He chases her around the pen, pecking and biting her neck and chest and pulling out feathers. When she tries to get in the pool, he chases her out. It's not constant, but it is frequent and alarming to watch. Waffles has been harassing her as well, but not nearly as badly. Pancake, however, seems totally fine with her being there. I'm assuming that this aggression is just a dominance thing, reestablishing the pecking order, since it looks much more aggressive than the mating behaviors we've been seeing. But how long does it typically take ducks to establish a new pecking order? And at what point would I have to assume that they won't accept her, if it continues? Thanks for any and all help.