I have two black polish chickens with white head feathers. They are living with silkies and have been getting a long fine from what I can tell. They all nest together and roam the yard together when I can let them out. There is one silkie rooster that is the head chicken and although smaller, the polish chickens, hen and roo, get chased away sometimes. I have been noticing that the top part of the polish chickens head, the male, the feathers were getting thinner and thinner. Today, the top of his head is totally bald.. you can see the shafts of the feathers are in the skin but it is almost bald in the center. Today I worked on building a new pen for him and her thinking that the silkies are pulling his feathers out. I won't be able to finish the pen until this weekend. It is below 32 degrees here in KY and I do not suspect parasites. Any information or ideas??