This might take a minute to explain, so forgive me. When we got our first 3 chicks, kind of accidentally, we converted our 18' X 20' horse shelter into a coop (at the time I didn't have any horses here). At the same time we got the chicks, we got a lamb and so we put her in there with them. For a couple of months, everyone lived together happily. I finally convinced my kids that it was unfair, almost cruel, to ask the lamb to live locked up like that and we didn't have the funds to build her a secure pasture, so we found her a great new home with knowledgable sheep people. Less than a week later, something climbed into the shelter and killed two of the three chicks. That same day, I received my new order of day olds. So, in order not to lose any more, hubby built a secure 4' X 8' coop that they are locked into at night and they run the shelter by day. The problem has just come up that the #1 roo has discovered he is a roo and is pestering the #2 and #3 roos as well as trying to mate the pullets. They are only 16 weeks old, so the pullets want nothing to do with him. I am having a hard time locking everyone up at night and basically making them a hostage to his antics. So far, no one has been bloodied, and I want to keep it that way. Hubby and I are already talking about a new and bigger coop/run setup (cause we NEED more chicks ) but that won't happen until Spring. I need to do something now. What I'm wondering (I know, you thought I'd never get there ) is that now that I have 2 horses here that hang out just outside the shelter all night, if I also use lights in and outside the shelter am I likely to be safe from nighttime predators so I don't have to lock them up? Part of me thinks it wasn't just coincidence that the others died so soon after the lamb left. I know it was a climber not a digger, most likely a raccoon. I just want to keep these guys safe and happy.