I found this video a week or so ago and I would strongly recomend eveyone that likes to keep their chickens in a main pen(not a tractor or rotating) to check this out. I'm sure people are already doing this method... this is just a quick video showing tips and what to do. I really like this, because I'm the type that was always used to my grandfathers way of keeping chickens, which was: there was one coop, built on the ground with one pen. Now... His run was pretty much all dirt, which I DON'T like about keeping chickens in a pen, but this video shows how you can plant some trees in the center, and put down hay(or leaves) for them to scratch in, and eventually make you compost! I love this!