I've re-typed this entire post as I didn't really ask what I wanted to. My main question is I don't really understand how chickens fit into the small spaces I've seen. 1. Say I have half a dozen chicks in a large plastic tub or dog cage. By the time they're eight weeks, won't they have outgrown this small space? 2. If I put the chicks in a growout pen, won't it have to be quite large to contain all of them? 3. When introducing new chickens to the coop, you're supposed to put them in a private pen for a few days, so the other chickens can get used to them. Won't the small space bother them?