We will be building a a 6'x12' coop. I'm only starting with 7-8 standard laying hens this year, and might pick up 3-4 chicks every couple years to keep the eggs coming for a time. These will be pets and I intend to keep them well after their egg laying days are done. I'm not going to have more than 20 hens max or less, though I have plenty of room to expand if needed (I have 5 acres). All this said, I'm trying to decide how big to build our run. As much as I'd love to simply free range, we just have SO MANY predators around here for the good of any chicken. So a run is a must. I would LOVE to make it big enough so that the grass stays MOSTLY green. Some brown patches are fine, but I just want the chickens to have some green. And I like to see some lawn too. So my question is how much space in the run per chicken is needed for it to stay mostly green? And what dimensions would you recommend for say 16-20 hens, considering that I will have to wire the top, too (we have LOTS of red tail hawks and coopers hawks). Any thoughts or advice on this would be awesome!