In my opinion, one of the things that most strongly speaks to the intellect of a parrot is the use and reworking of the words in its vocabulary. Taking two unrelated words and placing them together to form another word or phrase with an entirely different meaning is the “recombining” of words.
Many birds have the ability to put labels to the things around them  Some words are the names of objects, such as a bell. Other words are adjectives such as colors, big or small, hard ...

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