The Washington Post reports on scientific efforts to figure out why monkeys and apes don't make noises that sound like human speech. "Scientists figured there were two likely sticking points. Either the brain was not wired for speech in nonhuman primates, or their windpipes were shaped the wrong way."
Quick-skim spoiler alert: Seems like it's more of a brain issue.
Why can't monkeys generate speech?
Somehow the stuff stays out of their reach.
Parrots, of course, at least make the sounds,
But full understanding is out of bounds.