I am in the planning stages for acquiring 6-8 hens this coming year. I am currently working on coop design (awesome place to find so many examples!) and am currently debating between a tractor with attached run/yard space VS a stationary henhouse with run. So my question, for those with experience: 1- How long can you leave your tractor (eg, allow the birds to scratch in that area) in one place before the grass becomes too beat down to recover (what size in sqft and how many birds)? 2- Do you find that you actually move it around enough to preserve your yard? If so, how often do you move it? 3- Do you have problems with excessive weed growth after moving your tractor away (eg, nutrients from birds cause a sudden growth in weeds that outcompete the grass)? 4- Are you having problems with your tractors that you didn't foresee? Thanks all!