@ maclady -- mine do the same thing. They all go to one corner of the coop and jockey for the best position until they appear to be one big clump all grouped together tightly. It's funny how they always go to the same corner of the coop (front left side). I placed a couple on the roost the night before and three stayed up there through the night. Last night I placed 7 up on the roosting bars and eventually they all jumped back down to the floor cause they thought they might be missing some of the "fun" the others were having together in the corner of the floor. I'm thinking the roosting things comes with age and experience and am fairly confident they'll accomplish that goal too! I find it interesting as to how loud they "chirp" as it grows darker before going into the coop...it's like they're rounding each other up! It's a racket and a riot! I think raising chickens does something to the human brain...I'm beginning to feel obsessed with them and their behavior!
