APES LAUGH TOO. A ticklish baby orangutan named Naru frolics with a friend and makes little grunting laughs. A study of the sounds apes make when tickled hints at laughter’s origins. Miriam Wessels: University of Veterinary Medicine
Don’t try this at home, but tickling a gorilla, orangutan, bonobo or chimp can inspire bursts of grunting sounds.
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