About 5 months ago I purchased 6 chickens and 2 ducks. The share a hen house that's big enough for all of them. I habe a male and femal duck. My drake seems to think the only buff orphington in the group is a female duck. He keeps chasing her and grabbing her by the neck and dragging her around. He tries to mount her but is unsuccessful. I feel bad because if I'm tossing treats he chases her away and then she just goes off alone and avoids him. She starts squawking and running away when he gets near her. And then he chases her until he catches her. Has anyone else ever had this problem? Is there anything I can do? He doesn't do this to any of the other hens and I have 30 of them in all.