I moved to the city and my birds cannot find a suitable dust bathing area. I made them one but they do not like it. I will have to redo. In 30 years of chickens I've NEVER had mites or lice. So I'm late on thinking that is what this is. They've been wormed and had corid twice but I have a chicken with a very pale comb and white skin. I did see a video that shows the nits at the base of the feather so I'm thinking this is my issue. So I need something besides the diam powder to treat my birds? TIA!