Actually not sure if these feathers are cushion or tail coverts - hard to decide based on diagram I saw. Anyway...Top photo was taken Jan 22, 2016 and the bottom, blurry photo was taken today Feb 27. Lucy is 7 months old and is as friendly as ever. She is one of 5 hens - no rooster - and the only one doing this. The white feathers are rough but she doesn't look like others are pecking her. Will try to get better photo as well as check for mites, etc tomorrow. In the meantime, I appreciate any insight. Thanks.