So b/c of my introduction problems, my 2 pullets Audrey and Bianca are getting their own mini-coop in their own run adjacen to the other run. The idea is that over time Clarice (big mean boss hen) will get used to the idea. The mini-coop will be made using a dog house similar to this one, which I already have: It's 4.5 feet long, 3 feet high at the front, and 2.5 feet wide. There is plenty of room for Audrey and Bianca, but obviously once they are up on a roost, any ventilation I add at the top will be a draft blowing on their heads. The roof hinges up. I will be adding large, locking hook n' eyes to keep anyone from getting in (they'd have to get into the pen first, which is Fort Knox, but I take all precautions. I COULD add spacers to keep the top from lowering all the way (leaving a small gap). But again, that would be up near their heads when they are on the roost. How much do I need to worry about this? Obviously they will only be shut in at night and I will keep it VERY clean. Suggestions for how to ventilate it? I VERY much hope this will be needed no longer than a month. Obviously the goal is for them all to live happily together. But in the meantime I have to make things as safe and nice for them as possible.