When I first moved the chicks to the coop, I gave them this little dog house for their coop. They play all day inside the big coop, so I assumed they were sleeping there as well. I've never had reason to check in on them at night, but decided to tonight for no reason. When I didn't see any of them in the big house I walked around, and found all 17 of them packed into the dog house. Unfortunately, they started coming out as soon as they saw me. It was pretty funny though. They were packed in like sardines. 4 or 5 deep, and 4 or 5 tall. Of course I moved them all into the big house.