About 3 months ago we got some chicks from a lady who needed to get rid of a bunch of chicks. They were Polish, Silkies, and a few others. We took about 10 including 1 little female polish that had recently had all the feathers plucked out the back of her head which were starting to grow back again. Her feathers were grown back in no time at our house and everyone has been fine for months. 3 nights ago I went up and locked them all up as I normally do. All of the bigger chickens roost up in the tree but the smaller ones I lock up. The older only known Rooster on the property wasnt roosting so I locked him in the larger house and all the smaller chickens were in the small house. I let them out in the morning and the poor female Polish we got months ago, the back of her head was covered in blood and was completely bald!!! It looked sooo bad, with just tiny hole where the feathers used to be. I was sooooo sad and wanted to cry, poor little girl!! I took her down to my house and put her in a rabbit cage we have, shes been in there for 2 days now and she is very happy in there. I sprayed some product we have from the feedstore called Vetericyn, it treats many many infections, wounds, etc She didnt even budge when I prayed it on her head. I put a little baby silkie in with her to keep her company and she seems to be doing fine but now I am scared to put her back outside ever again once she has healed. I have no idea who could have done it, there was no bigger chickens in with her, the large rooster wasnt in with her, there is only smaller chickens then her in there. 1 other polish who may or may not be a boy is my only guess although I have never seen him act mean to any of them All the other chickens that are with her are silkies and are ½ her size or smaller Why after 3 months of having her would 1 of my chickens do the same thing that happened to her before we got her? Could it be because she is kinda shy and more laid back and mellow, kinda sticks to herself Would another female do that to her? Is it most likely the other Polish since its possibly a boy? And if so, is a Rooster going to do that to her again, maybe while trying to breed? I had planned on breeding the Polish but not if they are going to that to her every time!!