Hi! I know this is an older article, but this makes me feel more confident. I am going to have 13 chickens in a 8 by 5' space (40') I have a few bantams, and one big bird (a Brahma) so I was getting worried, as people said at least 4' per hen, and they would have about 3'. But now if I think about it, they will 27' of extra space, so that seems ok. Anyway, thank you!