I have been treating my flock for lice the past couple weeks. My younger birds who are kept in half of the coop my older birds share had visible lice on them (tiny yellow bugs). One in particular had them very noticeably, my older hens and Roos had none that I could see but I treated them any way. When I treated them again a week after the first treatment the only bird that still had any that were visible was my one and only white bird. The same one that had them so bad the first go round. Do lice prefer one color over another? Coincidence? Or does she maybe just have poor grooming skills?