I introduced a new pullet (12 weeks) yesterday to my two older pullets (25+ weeks). The two older birds never had any problems with each other. There was never any aggression towards each other, they never even pecked at each other. They were always pretty quiet and just seemed to be very happy. Everything was great. I put the 12 week old in a small dog kennel outside by the coop. At first the older birds didn't really care. Great! But then one of the older birds just locked in on the young one and has been trying to get to her. It's not a constant attempt to get at her, but when she is close to the kennel she is well aware that she is in there but she can't get to her. She doesn't try to attack the young one, she just stands there and stares at her. Sometimes she will seem as if she will try to peck her but then realizes she won't be able to reach her through the kennel. My guess is, she wants to tell her who's boss. And to be honest, before this, I was never sure who was the boss between the two older pullets since there was never a problem between them. Now my real question. Since she has seen the younger bird, the older bird has become very vocal. What is this about and why is she doing it? Last night I was sitting in my living room watching tv with my wife and son when I heard a chicken "talking". My first thought was it was the new bird. I went to check on them and it turned out to be the older pullet that was making all the noise. I try to keep my chickens low key so I need to solve the problem rather quickly. Since the new pullet is separated but the older one knows she is still there, is that her way of saying I'm in charge here? This is turning into a stressful situation for me.