I have a shelf under my hens' roost, and lay cardboard on it for easy cleanup. Along with the poop I find a lot of flaky stuff... originally I thought it might be a by-product of molting, but nobody is molting now. Here is a picture of what shows up under the roost. I've read some things that make me wonder about the possibility that it's scaly leg mites. It's hard to tell visually, here are a couple of leg shots... Any impressions of what those flakes are? Thanks.