I have an established flock of mixed breeds (14 total: 2 leghorns, 2 barred rock, 1 wyandotte, 4 americaunas, 2 buffs, 1 black star, 2 buckeyes). I have a pretty large run (about 350 sq ft) and all my chickens get along great. My friend recently got a chicken tractor-type coop with an attached run (like this http://cdn.backyardchickens.com/e/ef/efd15b28_57568_dscf4867.jpeg). Supposedly it will accommodate 12 chickens but that seems like way too many for the space. She bought 6 chickens (2 leghorn, 2 RIR, 2 cal gray or barred rock) about a month ago. Last week the two leghorns have attacked the RIRs and caused half-dollar sized wounds on their backs along with lots of missing feathers. I have the two RIRs at my place now, separated from my flock, so they can heal up. They are doing fine together. She wants to get rid of the leghorns since they're now attacking the other two remaining chickens. Do I dare take them? Will they be low enough in the pecking order to keep from hurting my girls, and should the behavior stop if they have more room to run around? They would be the youngest and smallest of my flock (although size didn't seem to matter with her birds). I have a large run but not a huge coop, and pretty cold winters, so I'm a little worried about them in the winter. I just have never had any aggression issues so I don't want to take any chances. Either way, I told her I'd keep them here (again, separated from my flock) until she decides what to do but haven't offered to take them permanently yet. I'm tempted, though, because leghorns are such good layers. Thanks for reading!