My 1 year old Polish girl has been pulling out her own feathers this week. We had a new chicken run built in our backyard to better protect our flock. In order to do this, we had two carpenters making a lot of noise in their area for 5 days (not all day long, but about 1/2 day each day). Out of 5 chickens, she is the only one exhibiting this behavior. She is normally our most confident chicken. All of her tail feathers are now missing and the feathers on her body are greatly reduced. I feel so bad for the little gal. We were going to have a fence put in as well, but now I'm wondering if I should avoid any more construction.