I have had two or three budgies in my family as a child and once bought one for my oldest son years ago.
The one we bought was from a pet shop who told us he buys the budgies from a local breeder. But within a couple of weeks of having the budgie he would fall of his purch and into the bottom of his cage with his head tilted to one side and trying to walk, as if he was having a stroke down one side and trying to walk... he would make little churping noised also like little squiels. I used to feel so sorry for him. He would be like that for about 10 mins or so before he would jump back onto the purch as if nothing had happened. After his attack (or whatever you want to call them) he would remain quiet for about a further 5-10 mins. This would happen about 4-5 times within 12 months but became more reqular before he passed at only 2-3 years old.
Just out of interest I was just wondering if anyone had any idea what it was that was wrong with him.
I would love to have another budgie but seeing this little one like this has put me of having another budgie.
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P.S I did mention this to the guy in the petshop who told me it was common in budgies from breeders.