I have 2 pet male ducks. Got them as ducklings and both turned out to be males. I used to have 3 but the one died before I knew the gender. I have one bigger male and one smaller male who is not all there in the head. The bigger one is now constantly grabbing on the small one’s neck and tries climbing on top and drowning him in water to mate. I can’t get any more ducks and didn’t really want to get rid of them. What else can I do to stop him? I’m afraid he will end up killing the little one. This is my first year having them as adult males