i have 17 hens that sleep on the roost in the coop, but i have a buff orp that is the last hen to join the flock, they knock her off the top roost and is forced to sleep on a lower bar.....sometimes she gets pooped on all night, she is very low on the pecking order she has to have a bath in the morning...i try to move her when it gets dark , most nights, think tomorrow hubby is going to raise that lower bar, so they are all on the same level...hope this works, all my hens are paired, always raised them 2 at a time (the same breed), but this buff orp was raised with a silkie roos and when she was 18 weeks i joined her with my hens, all my silkie roos (5 of them) are in a coop of their own