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Sounds made by a little-known monkey living in Ethiopia’s mountain grasslands may hint at the origins of human speech. Unlike most other primates, which communicate in strings of short, relatively flat-toned syllables, geladas possess uncannily human-like vocal tempos and undulations.
“When we first started working with geladas in 2006, we noticed sounds like people were talking around you,” said evolutionary biologist Thore Bergman of the University of Michigan. “Most primates only make a few sounds, but geladas produce a complex stream with a rhythm similar to language.”.
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