Hi from a tree full backyard in Tauranga NZ. I have a hoppy visitor helping itself to my Cat’s food. Sparse short tail feathers. It has been 2+ months now and no regrowth occurring. Can the lack of tail feathers be caused by a deformity or disease? Meantime it has adapted well and made itself at home. Safe in the company of two very idle well fed Cats who don’t mind sharing.