I have one drake that does fine when left with the flock, and in the past I have had drakes that had to be kept separate (a boys only pen and house) because they were very hard on the ducks even though there were 12 ducks to the 2 drakes. The problem I had was when I separated the drakes, they fought with each other. Because of some research -- I separated them even further so they could not even see the ducks -- this still did not help, and I was constantly having to treat wounds and separate the hurt one. I gave up and sent them to freezer camp