I have six ducks- all female, 2 India Runners, 2 Khaki Campbells, 1 Pekin, and 1 Muscovy. All except the Muscovy have been together since a couple days old, and will be three in March. The Muscovy will be 1 early next year, and has been here since March. There have never been any problems. The ducks go into a little duck hut overnight, and free range in the backyard during the day. Yesterday, I went outside to find the two Khaki Campbells fighting terribly. Sometimes the Pekin would run over and get involved. When I separated the Khaki Campbells, one would charge at the other across the yard. I noticed the smaller one was bleeding. I picked her up, and her rear toe on her left foot had been ripped out. She was also bleeding from the neck where she was being bitten. I cleaned her up, coated the wounds in neosporin, and put her in a big dog crate for the night. Today, when I let the girls out they all went and ate just fine. As soon as the girls were done eating, the khaki campbell who had been separated overnight ran over and attacked the other khaki campbell.I tried separating them, and as soon as they saw each other they were at it again. I've never seen ducks fight like this. Sooner or later the smaller one is going to get killed. Today I am letting her roam with the others, and put the other one up. Anyone have any idea what could get this started after almost three years, or what I can do about it.