My little Drakes all do good with my two female Muscovy but I too would not have trusted them with my huge drake that I had to rehome. He was brutal on both hens and drakes in the pen. I have learned larger Hens and smaller drakes seem to be best or the hens. That is what attracted me to the Call drakes.I'd think of putting them with the muscovies and making a larger pen, but I wouldn't trust the muscovie male to to turn into the Hulk on them all