Thank you for the information on sand. I was thinking of putting it in their small run. I have trays under my hens to catch the poop. The shavings have been messy to clean up. Sand would be ideal in the trays, then I can just scoop out the poop and leave the sand, just like in a litter box. I like the idea of sand in the nesting box. I will give it a try. I just don't want to spend my time fighting Mites.