hi we have a large barn that will have runs in it for the birds . i can't free range, we have way to many predators around here. i lost 40 birds in a week last time i tried. so my question is most of these are bantams but some are not, so how many feet per bird in the runs ? ive heard 2ft per bird but wanted to make sure. im breeding so some coops will have mixed sexes but some won't they will be male coops and female coops. then for those groups ill use breeding pens. (don't worry there will be some outside time under our watchful eyes) im thinking that the roo pens will need extra space so that they don't kill each other. any suggestions?