I am nearly finished with my coop, and am considering using a 2"x2" square shape for my roosting perch, or, a round diameter perch (about the size of the poles used for hanging clothing in your closet). I understand there are some discussions relative to the chicken's feet and their need to fully grip a perch so they won't spin or topple over (??? am not sure of the validity of that explanation). Can anyone offer any insight here? Please hurry as my chicks are ready to go into the coop!!!