My husband and I returned home at about 3:00pm today and let the girls out to play. Everyone was fine, we feed them some bread and they went about their business. About 10 min later my husband ask me to come out side and look at one of the girls. One of my Barred Rocks, Clara had just 1 tail feather. I picked her up and on further inspection all of the downy feathers on her back and down both sides of her neck were gone. You cant tell this from looking at her because her big feathers cover these areas. She also has a triangle shaped laceration to one side of her neck. We found her feathers in the yard near the house. I saw no bird in the sky and no other animals in the yard. We put Clara in the basement in a chicken pen we used when they were little. Its warm down there. We tended to her wound. The question is how long will it take for her feathers to grow back and how long should I leave her in a warm basement. I have a good tight coop and 6 other chickens. The weather here in Baltimore Maryland is about 48-50 during the day and 40-34 at night. Any advise or thoughts would greatly be appreciated.