I tried separating them yesterday and then snuck one back in last night while they were asleep. They didn't start back in right away, but eventually did. I waited both times until there was blood dripping and heavy panting. It did not appear that one was winning. I have one large coop 12 x 20 with 1/3 acre run and 15 chickens. I also have a small coop that is built for 6 chickens with a 5 x 3 run. I moved one Roo into it this morning. I guess I am fine with starting another flock and doubling my chores. My question is - should I put either some hens with him or wait until I get some chicks raised old enough to go in with him? Will he be too lonely for 3 months? Also, it is not heated at the moment so I would either need to get him a lamp or add the hens so they can keep each other warm. It is only getting down in the 20's right now but this is a mild winter. Thanks for any advice.