Scientists exploring the evolutionary origin of language have detected a vocal communication system among wild chimpanzees more complex and structured than previously known, with a dozen call types combined into hundreds of different sequences.
The researchers made more than 4,800 recordings of vocalizations produced by members of three groups of chimpanzees inhabiting Ivory Coast's Taï National Park, one of the last major remnants of old-growth tropical forest in West Africa and home to a rich array of plants and animals.
The order in which the chimpanzees produced the calls appeared to follow rules and structure, though the study did not include conclusions about any potential meanings. The researchers want to learn whether the various sequences communicate a wider range of meanings in the complex social environment of the chimpanzees. They have suspicions about the potential meanings of certain vocalizations.
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