Hello all- I just joined this site, and am new to chickens (I finally talked my wife into letting me get them) and this forum is GREAT! Please forgive my stupid questions for a little while until I learn a bit. Anyways, I read through some of the predator threads and haven't been able to find much on keeping the predators out. I just ordered 25 Cornish from McMurray to be delivered in the spring, and I'm planning on using one of the PVC tractors (the plan that's posted here in a few threads.) What is the best way to keep the critters out? I live in the Michigan woods, so the list of animals looking for fresh chicken will be long! I was thinking of putting cinder blocks on the corners to hold it down, then putting some type of a wire skirt on the thing all around- since it will be moved every day, I won't be able to bury fencing. Then I'll probably stake the skirt down. Any thoughts on that- will it work? Do the PVC pens work alright in general? Seems like a great option for both weight and cost. Thanks!