So, it started a few months ago. I noticed that my hens started to miss some feathers in spots here and there. Instantly I put DE on the hens, and then sprinkled seven dust around the pen in case it was mites. The patches became bigger and there were more of them. Then, we noticed that the male duck became agressive with the hens and started to chase them around the field with more frequency. There were times where he would catch hold of them and pull them to the ground with his beak and hold them there. This is where I think they might be losing their feathers. Now the agressive behavior has moved to my rooster as well. He is missing feathers around his vent. My rooster is quite a whimp. Before I relocate the ducks, do you believe this is the issue? Is this common? Is there anything else that could be doing this? Thanks!