My 5 1/2 old pullets are pouncing on the smaller ones (3 wk old) backs. The little ones shriek and run away. Is this normal behavior? I found someones feather out also- did one pull some one else's out? Should we put the 5 1/2 week olds (8 pullets) in the shed outside and keep the younger ones(8 pullets) in for a couple of weeks then put them together? What do you suggest?