Beautiful bird.
I used to help clean at a cat shelter. One of the cats that roamed the office looked like he was about a hundred years old. He WAS old, and had a metabolic issue that left him almost skeletally thin, and a non contaigeous skin condition that required a greasy medication. The full-time volunteers who handled adoptions said that any ugly comments about the cat were grounds for refusing a potential adoption - a litmus test of sorts.
I remember a video about a guy doing rescue out of his home somewhere in IIRC, Oregon or Washington state. In one scene he is draping a colourful little cape of fleece *feathers* around the shoulders of a tiny plucked 'too (?). Do they get cold? Have since seen many videos with adopted birds that may never regrow their feathers. It took some getting used to, now, I hardly notice. They are still birds.