Good Evening, I'm new to BYC and to raising chickens. We have 9 chickens, 7 of them are 2 months old and 2 are 2 weeks old. I noticed yesterday that one the chickens was losing their feathers and today she was bleeding. Can someone help me on how to take care of this? I have separated her one of chicken who has this the other chicken isn't that bad. Thank you in advance for help.