The poults were looking perfect when they were put in the pen and are still looking healthy now. The pens are exactly the same and they can definitely fly no problem. They seem to be huddling in the open and not in the corners of the pens. I think you could be right about them not being hardened off enough but the game farmer assured me they had? Do you think putting some 40 gallon drums spread out where they are huddling would help to split them up?