I was out cleaning the coop after our rain, and while moving some bricks that the feeders sit on, I saw lots of tiny red (and a few white) mites. I also compost, and have seen very similar critters in the compost bin- have always assumed that they were helping that process. Since I've been trying the "deep litter" method, is it possible that these are a harmless or even helpful mite? Or do they sound like bird mites?