I have 24 chicks that are 4 weeks old and I have been brooding them in my DD's upstairs bedroom. They have been in an enclosed area that gives them about 15-18 square feet of room, and they have outgrown their quarters, so today I moved them into a 6' x 10' chain link dog pen in my basement downstairs. I've been monitoring the temp in the upstairs bedroom, and it's running around 70 degrees. Temps in the basement are around 65 degrees in the warmest spots (with extra heat lamps running to get the temps up). Anyway, about 2 hours after I moved the chicks downstairs, one of the black australorps started picking and eating the feathers off her roomies constantly (and when I say constantly, I mean she does it continuously, like she's on a mission, walking up to any unsuspecting chick and grabbing a feather and pulling it, ripping it, out of the hen, then going on to another and another and another constantly). I haven't seen this constant behavior before. There was some mild feather picking about a week or so ago, but it had stopped and everyone was getting along. Since this chick has decided to pull feathers, there has been no peace in the flock as everyone is screaming and running away when they are plucked. Only one chick is showing this behavior. I have taken one of my small wire crates (about 1.5' x 2') and put this feather plucker inside that crate, inside the 6x10 dog pen so she couldn't get to the other chicks. However, now she spends every second jutting her neck through the wire crate, ramming and trying to get out of the pen. Should I just let her out and let her continue to pluck feathers? Or keep her in the crate? Will she settle down, or is she going to hurt herself or hang herself? I'm hoping a day or so of having full access to the food bowl might up her protein and get her feather plucking desire down. Any suggestions?