My 15 or so month old Silver Laced Wyandotte rooster is loosing its tail feathers and a few feathers on its chest. I looked him over good in both of the spots. His tail had tiny black specs, but they weren't moving and they didn't appear to have legs. There weren't a ton of these specs, but there were a few. When I looked on his chest, there weren't any of these specs. Any ideas as to why he's loosing his feathers? Thanks!