I have a question about our mean duck I think he is a drake since he lets out a loud whistle every once in awhile but he is constantly pulling the feathers out of the others and eating them. At this moment I have him in a separate box but this won't last for long..... They run from him. He walks on them and just is a bully. What can I do to correct this or any suggestions. They are about 4 1/2 weeks old. Thank you.