I was cleaning out my coop today and noticed some small black bugs about the size of a pin tip along some spots of the coop walls. They had very round bodies kind of like a tic, but like I said, very small. Could these be mites? None of my girls have been scratching excessively. They dust bathe regularly and I looked around the vent of one of them and didn't see any bugs. Could I have mites and my birds just haven't been infected yet? Is it better to treat right away like it is mites, or wait until symptoms develop? If I do treat it now, should I just dust the coop, or dust my birds too? Thanks!