So recently I noticed a tunnel from under one side of the coop and out the other. I immediately thought "Rats!" and in an attempt to nip the problem in the bud, went and purchased some snap traps. I baited them but didn't set them and left them along the back side of the coop, out of reach of the birds and dogs. After refilling the bait for 3 mornings I finally set them. Its been 2 days and so far I've caught 1 chipmunk. I'm not surprised. There are chipmunk tunnels all over the property in other areas. I don't mind the chipmunks, really. I truly hope it is just chipmunks. The current population of chipmunks provide hours of amusement for my dogs and, I have to admit, look adorable. Rats, however, give me the heebie-jeebies. I am worried that if it is rats that, come winter, rather than stick to their tunnels like the chipmunks, they will decide that the house would make for much more comfortable living. So, what (short of installing a game cam or spying with night vision goggles) would tell me if these tunnels are made by chipmunk or rat? I have found no feces to help aid in identification. Food is put in metal bins each night, though I'm sure there is a small amount left scattered in the deep litter of the run.