Why laughter may be 16 million years old
Here I’ll provide similar accounts for gorillas and orangutans . Collectively, they suggest laughter’s evolutionary origin extends back at least to the great ape common ancestor, which roamed the earth some 14 to 18 million years ago .All four gorilla subspecies have a vocal repertoire that includes “pig grunts,” “lip-smacking,” and the characteristic “hootseries,” the loud vocalizations of mature silverback males that often precede their chest-beating displays .
. From a lazy sunning position, Uncle Bert had watched the youngster’s approach, then quickly plucked a handful of white everlasting flowers to whisk back and forth against Digit’s face, as if trying to tickle the young male. The action evoked loud play chuckles and a big toothy grin from Digit, who rolled against Uncle Bert’s body, clutching himself ecstatically before scampering off to playmates more his own size.
During these relaxed sessions I learned a great deal about gorilla behavior that I had not gained previously from free-ranging animals who had yet to become totally habituated to my presence. Tickling between Coco and Pucker provoked many loud play chuckles and also lengthened their play sessions. Tentatively, I first tried out tickling on Coco, and after receiving a very receptive response tried it later with Pucker.
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