Someone is digging and it's one or more of our chickens. I guess it's normal but it seems like it's getting kinda deep. I don't believe it's anything but a chicken because there's no digging on the outside of the run at all. Only inside but next to the fence. They can't dig down very deep can they? We had this with our rabbits and they almost dug clear out of their pen so we put wire on the floor of it but I'm not going to do that in the chicken run. We do have our fencing buried so unless they go down a lot (maybe 12") they can't go sideways.