I was visiting a place that takes in rescue animals, in this case they had a lot of birds.
In their typical speech to people about NOT keeping birds as pets they described some of the birds as "highly curious, the maturity of a human 5 year old, with an intense desire to be destructive".
On top of that, they have one tool, and it's a pair of boltcutters you can't take away. And the most clever of them have a good chance to outlive their owners.
And the means to achieve that destruction. Cockatoos are like flying bolt cutters.
I aspire to one day befriend a local murder of crows. Not to keep as pets or to make dependent on me, but maybe to bribe to clean up trash or steal quarters for me... or to defend my honor should the need arise.
My wife always joke about how parrots sound like a fun pet until you consider the phrase "Flying eternal toddlers, that cannot be diapered or potty-trained, with can-opener mouths."