We have an assortment of chickens- a Buff Orpington, RI Red, Silverlaced Wyandotte and an Andalusian. They get along fine as far as we can tell...however, lately, only the Buff Orp is sleeping inside the actual coop. The other three are sleeping on a roosting bar in the pen underneath the coop. This seems odd to me, considering it is January. We keep the inside of the coop very clean...not sure a chicken really cares. I just can't figure out the sudden change.