I have searched this forum and did not find anything about roosting space required per bird. Does anyone have a general rule on this. When building my coop I didn't consider roosting space per bird. I am having an issue with feather picking and read that stress from not enough roosting space could cause this. I have several hens with feathers missing from their backs. I thought I had to many roosters, 3 for 21 hens, so I culled 2 roosters. Yesterday I saw a hen picking another while she was dust bathing. So maybe the roosters weren't the problem. I have about 5 hens out of 21 that have bare backs.