I have a deep layer of wood shavings in the coop, and right now the chickens have the coop open so they can go in and out to the enclosed run as they please. They have made several dust baths outside, but yesterday they dug a HUGE hole in the wood shavings. A mass of shavings are outside in the run now, and the coop door won't close there's so much debris on it. I assume they were having a dust bath in the coop, since it's been raining a lot recently. But SUCH a mess - more like a dust storm! Anyone else seen this behavior?