How do I stop young ducks from eating each others feathers. I have been having trouble with some of my younger ducks stripping the feathers off the wings and back of their pen mates. When I see this happen I will either take the aggressor out and move it to another pen with larger ducks or take out the picked on duck and move him in with others. The ducks normally start this at about three weeks of age when they start getting their adult feathers. They always have food and water available but for some reason once they start eating feathers, it's hard to get them to quit. And if two gang up on another, its wings can be stripped of feathers in just a few hours.