x4! I've definitely known some roo's to be very calm, and I've seen lots together with no problems. Space really is a big thing!That whole "roosters fight to the death" thing is quite overrated. I have 5 roosters in my main coop and 3 roosters in a grow out pen with 2 pullets and 4 hens. Most of my guys are in the 5-6 month range, with one 18 month old rooster. There's been no fighting or injuries. Space is the big thing, plus just having roosters that are laid back.