I have 4 pekin ducks, 3 drakes, one hen. we didn't know their sexes when we bought them. the top drake was attacked by the other two yesterday. his wing ended up bleeding, so we separated them. now the other 2 drakes are fighting. once we let them out, they wouldn't let go of each other. i really don't know what to do. i don't want to get rid of them, but my parents won't get two more girls. how long will this fighting last and is there any way we can keep them for fighting?