I have 10 easter eggers and introduced 6 bantams around late July. We halved the run and used a mini green coop as their night-time sleeping arrangements. Did the whole separate, but live side-by-side bit, and then they foraged together. No major issues and they began to live together. Tried keeping the whole flock in the coopf for two days on two separate occasions. BUT the bantams won't use the coop, except (in the last couple weeks) one has. The silkie goes inside the mini coop we have inside the run still, and the rest roost on bars and branches we have in the run. Freezing cold, rain, wet feathers and all, four of them choose to roost outside. What do I do?