Scientists specifically studied chimps’ “unvoiced calls” that do not engage vocal cords, but instead sound like human lip trills.
| Photo Credit: Getty Images
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The late primatologist Jane Goodall would famously begin her lectures with an exuberant “pant-hoot” crescendo to demonstrate how the subjects of her study, chimpanzees, communicate with each other over long distances.
Published – November 11, 2026 11:52 am IST
