Noam Chomsky on Nim Chimpsky and the Emergence of Language: https://www.youtube.com/watch?v=a39vcatTCVU
Chomsky has a few other interviews where he addresses this.
I owned a parrot for a few years. The speech she had was like a tape recorder, she could mostly only play back what she heard in an identical manner. But she was able to play back pieces of appropriate snippets in the right context to express herself to a level that I'd call it talking. It's not normal "speech", but if you gave an otherwise normal human with damaged speech centers in their brain a tape recorder it's very much like that.
In other words a baby saying “milk” because it wants milk doesn’t mean you should ignore it because it isn’t using a “language.”
Ok. Hi cat. Do you need language to communicate? Plz respond.