Currently building my coop. Since I live at the edge of town next to BLM land, I have tons of wildlife in my neighborhood. The wildlife express lane is next to my garage. We put up a game camera about a year and a half ago hoping to see a mountain lion that most everyone in the neighborhood had seen or heard. Never got a picture of her, but our list of animals we have gotten photos of is pretty extensive. In order of frequency: 1) deer (giant rats) 2) house cats (feral and not) 3) raccoons 4) foxes (very bold, one came right up to me while grilling one evening) 5) turkeys 6) rabbits/skunks, very rarely Sometimes foxes are ahead of the raccoons. Coyotes are very common to hear, but have always kept to BLM land. So, the reason I am giving you all this background is because I'm not sure if I need to install a skirt around my coop/run. Our property is completely fenced with a 6' tall privacy fence. Our dirt is VERY rocky. We even have a surface boulder less than two feet from the coop. When we dug down into the earth for our perimeter foundation, we had to use a Pulaski (think pickaxe) to get down to the level we needed. The foundation is eight inch deep, six inch tall solid concrete blocks. Since the coop is on a slope, the back is the shallowest with only one course (6") of block. The front is the deepest with three courses (18"). Since I'm sure there will be people who will suggest putting the skirt in anyway, my other question is, what animal would I be keeping out by doing that? What animal would dig through such rocky dirt that deep? These are sincere questions. Thanks in advance!