The obvious thing here is that cockatoos need to be flying in their trees, chatting with their own kind, preferably in Australia. It's a sad reality that they have become household pets. I could never take one on myself - I'd never get over the wrongness and the imprisonment therein of making these glorious birds pets. Not to mention, it's a lifelong commitment, when you consider that they (and other similar birds) have a life expectancy of 60-80 years. And ... they are a lot of work -- a lot of work.
Here's an example of a different cockatoo, different owner, having a power struggle over going to the vet to have his nails trimmed. (The pet cockatoos must really hate that event, I gather.) The owner gets out the carrier to take him, and the cockatoo knows what is happening. He stresses about it quite vividly. If you watch this video, watch it all the way through, because the first half is his maniacal chanting: the second half is his comical transition into a tantrum. I could swear he says he would
"die" if he has to go. This video has over 4 million hits.
(This owner, by the way, has given his home over to the cockatoo. I viewed a few of his other videos, and the damage along the molding in his house is dramatic in some rooms.)
https://www.youtube.com/v/5UUjJysUMTw