A laugh can hint at where someone grew up before they say a word. A drawn-out vowel or clipped consonant may place a person in Boston or London. But humans may not be the only primates whose voices carry traces of home.
Young chimpanzees develop population-specific vocal patterns that become more recognizable as they mature, according to a study in PLOS ONE. The findings challenge the idea that chimp calls are programmed entirely by genetics. Instead, vocal traits may also be shaped by companions and surroundings.
“Understanding how communication develops during early life is fundamental to understanding animal behavior,” said study lead Kassandra Giragosian in a press release. “Our findings show that chimpanzee vocalizations are not simply fixed from birth but continue to develop as young animals interact with their social and ecological environments.”
Young Chimpanzees Develop Population-Specific Accents
Researchers examined grunts, whimpers, and laughter of infant and juvenile eastern chimpanzees from two geographically separated populations. One group lived at Gombe National Park in Tanzania, while the other lived at Chimfunshi Wildlife Orphanage in Zambia.
Across all three call types, the team found acoustic differences linked to where the chimpanzees lived. Those signatures became easier to distinguish in juveniles than in infants. Grunts and laughter contained clues to population membership early in life, but infant whimpers did not. That distinction only appeared during the juvenile years.
Explore All OptionsThe pattern resembles how human accents become more pronounced as children absorb nearby speech. It does not mean chimpanzees use language — human language relies on shared vocabulary and grammar. Still, chimpanzee vocal communication may be more flexible than once believed.
How Researchers Detected Chimpanzee Accents
Rather than comparing only adult chimpanzees from different communities, the researchers investigated how vocal patterns changed during development. They analyzed 11,225 recorded calls from 21 infants and 10 juveniles, including 4,733 laughs, 3,694 grunts, and 2,798 whimpers.
The team measured acoustic characteristics, then used statistical tests to determine whether a call revealed which population produced it. The analyses distinguished the two sites across all three call types overall, with identification becoming significantly more accurate among juveniles.
Because this was a retrospective study, recordings from the two locations used different equipment and protocols. The researchers acknowledged that limitation but found recording quality unlikely to explain the structured patterns across call types and ages.
Why Chimpanzee Accents Matter for Human Communication
Scientists have known that adult chimpanzee communities can sound different, but it has been difficult to determine whether genes, habitat, or social experience created those variations. Looking at development offers a new clue — if vocal differences grow stronger with age, young chimpanzees’ experiences may help shape how they sound.
The study cannot separate the precise influence of genetics, social learning, and habitat, and the researchers caution that these forces may work together. Even so, the results show that a chimpanzee’s voice is not merely a biological preset. It may also carry an audible history of growing up, fitting into a community, and learning what home sounds like.
Read More: Some Chimps Treat Crystals As Precious Items, Showing How Our Roots for Aesthetics Run Deep
Article Sources
Our writers at Discovermagazine.com use peer-reviewed studies and high-quality sources for our articles, and our editors review for scientific accuracy and editorial standards. Review the sources used below for this article:
- This article references information from a study published in PLOS ONE: Ontogeny of dialects across chimpanzee vocalisations
