I agree if the drake is being that abusive he needs some time out, after you have separated him for the others and you see it's still going on then it's elimination until you find the the female doing the abusing, and separate her. I would bet it's the drake though, but seeing your in AUS are your ducks still mating?personally hi would separate the drakes. you say that you still going on the whole time? that he pulls out the feathers and leaves and bloody or next that behavior seems extremely aggressive to me, but my experience is not as knowledgeable as others on here. here are a few means that I will tag to get their attention to this matter they may be able to advise you better. is there any way that you can get us pictures?
@Miss Lydia , @Amiga , @SilkieSensation , @LadyHawkeAvry , and there's Kathy... her name is castophony or something I forget how to spell it.