A Bird’s Eye View of Human Language Evolution by Berwick, Robert C., Okanoya, Kazuo, Bolhuis, Johan J., Beckers, Gabriel J. L.

“…Strikingly, the capability for auditory–vocal learning is not shared with our closest relatives, the apes, but is present in such remotely related groups as songbirds and marine mammals. There is increasing evidence for behavioral, neural, and genetic similarities between speech acquisition and birdsong learning. …”
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