I am new to the whole chicken farm and I just moved to a new state so I am not even familiar with the area. I have three chickens, two my husband brought home so they brought pests with them. They had lice and I treated them with Python dust. I bought it at the co-op and it is for large animals ie cow ect. and the lady said to just light sprinkle them. I think it worked. I did the chickens and their bedding twice and then the chickens two more times. I took one of the chickens the vet and he made a comment about mites. Her feathers around her tail are all broken but she has her tail and I had just treated them twice and she seemed to be getting better. The other one was worse and is now fine. Now her feathers are broken 1/2 way up her back??? I am confused. I can see flakes on her and the other chicken but my chicken seems fine and the other one seems to have all of her feathers intact. What should I do?? This one chicken has a really curved beak too so I am not sure how healthy she is in general. She does eat like a horse. The two chickens my husband rescued were suppose to be 12 to 16 weeks but now they would be 6 to 7 months and we mabe get an egg a week total from the two. They are bantam ameracanas but they lay brown eggs.