Given that smiling/laughing is a primal instinct that we do not do on purpose (babies laugh when they are happy) to express happiness and joy, are there any other species that do the same?
In: Biology
Chimpanzees definitely laugh. When a chimpanzee smiles out of joy you can’t see its upper teeth. When they make a very toothy “grin” it’s sometimes called a “fear grimace”. Lower ranking males will sometimes approach and display a fear grimace to a high ranking male to demonstrate “hey I’m not a threat.” Hierarchy and rank is very important in chimp society!
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