Scientists studying the evolution of speech have long puzzled over why there are no good models in primates. While primates share many traits with humans — they've been known to play, grieve, fight, even laugh – speech isn't one of them.
With one possible exception. A group of wild monkeys from the Ethiopian highlands called geladas, which are closely related to baboons, make gutteral babbling noises that sound eerily human-like. And they do it while smacking their lips together. The combination of lip smacking and vocal sounds is called a "wobble." A study in this week's issue of the journal Current Biology analyzed the rhythm of the wobble and found that it closely matched that of human speech.
Written By: Jenny Mardercontinue to source article at pbs.org