Cockatoo finding out he is going to the vet

Max knows when he sees his carrier that it's a visit to the vet and gets pretty vocal about it. Max is saying his own words that only he understands for the most part. The only things I know he is saying is “I don't wanna“ and “What did I say“ He is actually a very happy and loving bird, but like any kid, he needs to express himself every now and then.