Do you mean "A" particular one "who was trained" or<quoted text>
How about you proving that the African Grey Parrot does not talk and understand basic human language.
You are now on the stage with the spotlight on you. Dont disappoint us. I want to see scientific facts and research to back up your claim.
The African Grey Parrots as a whole?
Because if the African Grey Parrots in general understood basic human language. They would be flying up asking people questions.
Meaning they had learned independently by their own reasoning skills.