I have 5 4 week old ducklings (2 Rouen, 1 Black Swedish, 1 Blue Swedish and 1 Buff) They're new wing feathers are coming in and one had a small bleed. (Everything is fine now.) However one of our other ducklings will not stop biting those wing tips and making them bleed again. I don't know how to get her to stop. I had them separated for a long time and that didn't seem to help. Maybe they are bored? Any ideas to help get that one duck to leave the injured one along would be much appreciated.