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Gorillas bare their teeth in a playful "grin" to reassure one another during play, scientists have discovered.
This "flash of teeth" seems to let their playmate know that they do not intend to harm them.
The researchers, from the University of Portsmouth, study the facial expressions of primates to uncover the evolutionary origins of human smiling and laughter.
They published their findings in the American Journal of Primatology.
Gorillas grin 'to reassure friends'
Seeded on Mon Jan 30, 2012 10:11 PM EST
Article Source: BBC News - Japan hit by massive earthquake
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