To step back from the question a little: the purpose of a brain isn’t to be human-like, it’s to help keep the brain-haver alive. Human brains are not “more evolved” or “better” than parrot brains, they’re better at doing human brain things to keep a human alive, and parrot brains are better at doing parrot brain things to keep a parrot alive. Language is a human brain thing, so human brains are better at it.
Parrot brains are bad at understanding the meaning of words for the same reason human brains are bad at instinctively mimicking sounds like a parrot, or learning to map the world by screaming like a bat.
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