Quote: Without actually seeing the critter first hand, I 2nd the suggestion to set up a game camera trained on the coop / run at an angle allowing for the most coverage; maybe even two cameras, and a loaded rifle (assuming there are no rug rats living there) handy for immediate use. If you're nervous about having a rifle at the ready, if the camera(s) record an image of the critter, you can then buy, or borrow, a live trap ( I use Hav-A-Heart). Yet another option would be to contact someone who's in business to rid customers of pests (squirrels, coons, etc). There are a couple such guys around here.