How warm is it in the area where they are being brooded? Honestly might be better to turn the light off if you think they'd be warm enough together. They don't have very good night vision, and they wouldn't notice her bum in the dark. My chicks get rowdy if I turn on my overhead light. I keep on just a lamp and some little paper lanterns and they're pretty peaceful with that level of light.Great ideas. Can I leave the cardboard for tonight and add a wire partition tomorrow or should I cut a few windows in it before I go to bed? Sorry to have so many questions!