Hi there, I'm new to quail mine are 8 weeks and we have 20 of them in a colony.The pen is 4'x8' and it is about 5'6" tall. We put that netting that you wrap around cherry trees 8" below the roof so when they fly they don't get hurt. It seems to be working well for them and this way my son can get in there and clean it out. I'm thrilled that he can do "farm chores" in the city. Hope this helps.