And added to that how difficult it can be for long-lived birds when their caretakers die and they can be left with somebody who doesn't really like them (or whom they don't really like), or donated to a zoo... a family friend's parrot was given to a (very good) butterfly house when she died and he just seems so sad every time I see him now
Maybe I'm just being narrow-minded, and the exact same thing is true for dogs & cats