Esther, my ISA Brown pullet, is pulling out her long tail feathers. I caught her doing this yesterday. She is not eating them, but there is mess in my yard (they free range every day). This started after we had to re-home a "she" EE two weeks ago, that started crowing almost all day long. Esther was his favorite. They were always together. Could my little Esther be pulling out her long tail feathers as a sign of grief over losing her best friend?