We have 4 buff orps. I have a coop with some sand in it, cleaned daily, and sand, grit, DE, and wood ash mix UNDER the coop and in the whole run area. In the hot afternoons, my girls love to go back in the run area and under the coop in the shade. My mix is fairly deep and they make depressions and love to lay there, but I have never actually witnessed the 'dust bath'---flapping wings, throwing the stuff up, etc. I just want to make sure they are doing it!