I have our run built like Fort Knox (I hope) but my brother destroyed my sense of security by asking about burrowing animals - ground hogs, etc. I haven't seen any mention of any kind of burrowing animal being a threat to chickens so I'm wondering about them now. I saw where a ground hog had burrowed from one side to the other under a 8 ft concrete slab - that's spooky! Has anyone had a problem with something burrowing (not digging) under the 2 ft skirt carpenters wire around their run. And, if you have, what did you do about it. I sure hope those critters aren't a problem. Thanks in advance.