I know it is important for chickens to have a dust bath in either dirt or sand but mine ( Easter Eagger 2, RIR1, and Black Sex linked)hatched on October 17 could not care less about doing it. We are in Southern California and I have provided a space both inside and outside the run for them to take a dust bath but they still "dust bath" in the pine shavings inside the coop. What am I not providing for them?