Can someone tell me what mites look like? My hens' feathers look kind of ragged, mostly on the tip of their tails, but I DO NOT see any mites or lice or anything crawling on them. What I DO see, is when I went to change their bedding today, I saw some small, black, fly looking insect-like things. They jump and fly. They are very small. Not a million or anything, but they are there. What are they? Do we need to disinfect the coop and them? Thanks!