Considering adopting a rescue budgie

Been thinking about adopting a rescue instead of buying from a breeder. Any experiences with rescue birds in Ontario? What should I expect in terms of behavioral challenges? Which rescue organizations do you recommend?

Have you noticed any other changes? When my cockatiel did this they were also plucking feathers.

I've had birds for 15 years and I've seen this many times. In my experience it usually comes down to boredom from lack of enrichment and mental stimulation.