Yesterday we added two females to our one female one drake flock. They are smaller than both of our original sucks and about 9 months. Our current ducks are full grown and we have had them since September. My set up is a cage with a kiddie pool and dog house. We don't have a huge free range area but big enough for the two smaller ducks to runaway from the two original bigger ducks although they don't. When we brought them home we put them in the pen and the bigger ducks started gnawing on them but not aggressive. The two bigger ducks will sit next to them and chew on their feathers but are not aggressive really. This morning the ducks were less in the newer ones business and tonight the younger ducks are missing feathers and are bleeding, one is even missing skin.we have them in a kennel now but still in the pen so they can see each other but no biting can happen. The bigger ducks are all over that cage. What should I do to integrate the newer ducks more properly? I want to wait until they heal up before letting them out of the kennel but don't know where to go from here.