Researchers tracking grunts, whimpers and laughter across two geographically separated chimpanzee populations found that vocal differences sharpen with age. Their findings challenge the long-held assumption that the chimp calls are inflexible and determined solely by genetics. Eastern chimpanzees (Pan troglodytes schweinfurthii), a mother with a young, at Gombe Stream National Park, Tanzania. Image credit: Ikiwaner. “Dialects are a vocal signature...
