...or not on wheels----ours was just a lightweight PVC frame with chickenwire wrapped around it. I only had 3 chickens, but they did a FANTASTIC job of digging out the bermudagrass that had crept under the fence from my neighbor's yard and overrun mine. And the soil was dramatically improved everywhere the tractor got moved. The eggs were wonderful, too. Unfortunataly houses were built behind us and I got worried that the jerk who moved into one of them was going to report us to the city for having them, so I had to give them up. When the sun was up, they clucked, you know--very disturbing. We aren't supposed to have "barnyard animals" although you can have a dog that barks day and night....getting off my rant now.....