These stylised, repetitive behavior, is caused by being kept in a cage , kept from doing normal behavior, from moving, from making choices. It used to be seen way more often when animals were kept in bare small enclosure like at zoos.
For Bingo, being in the cage all tge time, is having a negative effect on him. He as an individual need more stimulation, more time out, more enrichment and stimulation. It's also why the over preening.
I thought we made that clear, while still trying to be nice. But I will be extra clear , this parrot need more. it need more time out of the cage, it needs help st this point to engage more with the environment, im sure he is also shutting down, so you might say oh well he doesn't do anything. Thsts because tgey retreat into their minds. You actually have to help rehabilitat them, to reconnect thrm . To get lots of stimulation sbd foraging, abd exercise.
A parrot is too smart to active, some individuals can't cope as well with hours abd hours sbd dsys abd dsys of just sitting in the cage. Even a large cage simply isn't enough.
We call this benign neglect .
But it isn't benign,
Their are always excuses, but there are also always work around too.
To me if his needs can't be met, then rehome him would be kinder. Than to spend more years sitting in a cage. Next to a gmhaloy pair bonded partots who get to get out.
When they do these repetitive behaviors it releases endorphins,
The brain is trying to medicate itself.
Because the normal endorphins from exercise, from play, from social contact aren't getting released.
" the captive environment does not fully cater for the species-specific needs of an animal, or if it imposes unnatural stress or frustration, there can be a deterioration in the animal’s physical and mental health. This may manifest in the development of physical disease or abnormal behaviour."
https://www.bornfree.org.uk/zoochosis