have had 3 buff orpingtons for 9 months now, built a new, larger coop, thought I'd done my homework and bought 3 barred rocks at Collinsville trade day yesterday-brought the 3 new girls home and put them in coop with the buffs-immediate fighting between the boss orp and the obviously boss rock-looked like a cock fight-let the orps out to free range and got them all up at dark-literally sat the rocks on the roost with the orps. was at the coop at 6am waiting for them to come off the roost to see how they'd act-all the orps pecked at the rocks, but no real fighting. coop opened, orps came out, followed by rocks, but orps chased rocks back in coop. now rocks are hunkered down in coop while orps are doing there thing around the pond. hoping for the best, since I don't have another coop to separate them. hoping everything works out!