I used to have a pair.... then a trio. I found that the SLOs are so docile that a 4th was fine. The roost in the tractor is short because the set up is narrow. It's tempting, though. I also have the advantage of sending the extra female to @homeschoolin momma. Most of her birds can be traced back to me in some way, so it's like having my own back-up flock. I'm trying to talk her into taking one of my turkeys now. That hen has such a social, funny personality. Processing this year's boys will be hard enough, but I don't think I can do her. Beside, there's not much meat on her. I also have a friend in WI that is always up for more feathered friends.