I think you just have to separate the aggressive drakes from the others for the time being. I would expect the aggression to reduce by late summer.That's what I've been thinking. Although I lost a drake, Skylar, who was the same age as Sheldon, one of the hens, Quinn, was the duck "queen." She, much more than the three boys I got with her (neither the breeder nor I had any duck-sexing skills back then) was the flock leader.
I just hope it ends soon. Very, very soon.
I now have two of my flock of drakes--both pekins--sleeping in dogcrates in the coop, with their own food and water. That is to stop my meanie muscovy drakes biting them and excluding them from food and water. They are all out together free ranging during the day. There is some petty occasional pecking at each other but they all have room to get away from each other in my back yard. I was advised, by Miss Lydia, to have separate stalls for the drakes in my coop. With the right materials and some difficulty, I could probably build separate stalls. But two 30" dogcrates fit neatly next to each other and all the ducks are now happy going into the coop.
