I have two chickens with feather issues. The first is a Cucku Maran that is about 3 years old. She had a lot of feather loss on her back and wings from my rooster, but after putting a saddle on her I did not see any improvement on her back and wings. Then she started to lose all the feathers on her tail too. She lays me an egg almost every day, but when she started to lose her feathers her shells got very thin and much lighter in color. I have plenty of oyster shell available and all my other hens have nice thick shells. She has looked like this for over 6 months now. Thoughts? Suggestions? I did remove the poop that was stuck in her feathers right after I took the pictures. My second hen is a bantam frizzle that is about a year old. I have witnessed the other chickens actually plucking her feathers right off her body and eating them. She now has almost no feathers and tends to hang out by herself (understandably). Will her feathers grow back? What can I do to help her? She used to look like this. Now she looks even worse than this as this picture was taken a couple weeks ago. Any advice will be appreciated. Thanks!