I found Tailfeathers while looking for help for my 10+ year-old budgie, Chiquitito, who flew in through our window and changed our lives for the better.
He's been unable to use his legs very well, mostly pulls himself up by his beak, and seems not to be able to put weight on his right claw. We thought it was arthritis-- I covered his perches with moleskin and this seemed to help. He sleeps on the sort of platform we built out of three perches, and seems more comfortable, but he's definitely ailing. I called the vet and he said it was an abdominal tumor-- that made sense, b/c he has been wheezing. It must have been he had trouble breathing, poor thing!
We got him a smaller cage b/c his friend, Pearl, who is five years younger, was fighting with him. Now Pearl seems sad, besides being his usual skittish-budgy self. It was Chiquitito who always showed him what to do, and now he can see that he's not doing well. They don't chirp as they used to, either.
I read all the posts about tumors and adjustments for runner budgies and arthritic budgies, which were all very helpful. We want to take good care of Chiquitito-- we adore him!-- but don't want to subject him to an x-ray or surgery. At this point, even a ride to the vet will be traumatic. We lost another budgie, Pretty, after taking him to the hospital 5 yrs ago.
I'd welcome any other ideas... oh, yes-- some of you did say that it is probably the diet that causes the tumors. Most likely, it is. We could could never get them to eat vegetables or fruit, but we'll definitely try again!