All my tiels except for one have been from bad homes. The one who wasn't was abandoned by her parents at weaning I watched her very carefully before intervention but she wasn't reliably eating solids and needed topping up. Her death was a shock, she broke her neck in her cage overnight

I guess with Harlie we had 9 years together, she outlived my other rescues with the exception of another tiel called magic who made it to his mid - late teens. Harlie was still young when I asked her owners to hand her over but yes she wasn't looked after. Tiny cage, smoke filled house,a mainly sunflower diet and kids that terrorised her by poking things at her, shaking the cage etc. She couldn't fly, even climbing around her cage her balance was shocking if she made a mistake with her footing.
I'm amazed how far we came in the end because it was looking like she would never trust a human yet the night before her death she was flying back and forth confidently and with accuracy, then demanding cuddles in between.