I have 14 6-9 week old pullets (SLW, EE, Cuckoos, and Dominiques) and was super excited to find someone who had some 12 week old B.O/BCM. They are HUGE! I've had them for three days now and they at least twice as big as my oldest (SLW) chicks. I have them separated but within sight of my young flock and they 'get into it' through the wire from time to time. How long should I keep them apart? I'm worried because yesterday when I let them have a little supervised free time in the run, they immediately chased every chick away from the water and food by pecking them on the head. Will I have to keep them separate until my chicks are a comparable size? Or will they mellow eventually?