I purchased a dozen chicks yesterday afternoon from my local feed store. I've had to put one in "time out" (also referred to as "chicky jail") overnight. She's not larger than the other chicks either -- she's a little on the small size. But she's meaner than anything! She will peck at the others eyes, peck at their toes then drag them across the brooder by their feet! I removed her last night because she just wouldn't stop. I haven't tried to put her back in with the other 11 chicks this morning yet because I'm afraid she'll just attack again. She is a "barred rock". She is picking on all of the other breeds of chicks including the other barred rocks. I checked out all of the other chicks and one of the RIR has one of her eyes shut and it has some red around it. I believe this is from the barred rock pecking at her. I hope that she hasn't put one of the RIR's eyes out! Also, what do I do to help this RIR? The dozen chicks I bought are 3 barred rock, 3 RIR and 6 Easter Eggers (but purchased as Ameraucans, Araucanas, whatever). I was told that it was ok to mix these breeds together as chicks.... Am I doing the right thing by removing her and just keeping her separated? I just don't want to let her hurt the others. Why would just one chick be so aggressive? Could it be a roo or something? Or just a mean bird?