My Rhode Island Red is about 16 weeks old and while her tail was never very thick she is down to one sad feather, but no bald patches. . I thought at first it may have been one of the other girls but I spend a fair amount of time around them and there is not any excessive or aggressive amount of pecking, usually they give each other some neck pecks around snacks. No mites… and she seems otherwise very healthy..Kind of out of ideas of what is going on… I am including some pictures. Any ideas??