Oct 5

Happy World Smile Day! Did you know that today is dedicated to smiles and kind acts throughout the world? Smiling is a universal sign of affection instinctive to us all. But have you ever wondered where our grins come from?

Cheeky monkey

Smiling may have originated from the bared teeth expression made by monkeys when frightened. But in higher primates, teeth bearing is often a sign of submission and non-hostility from a subordinate member of a group towards a dominant member.

Picture of Grey-footed chacma baboon showing submissive behaviour

Grey-footed chacma baboon showing submissive behaviour

From signalling non-hostility and appeasement, teeth bearing is thought to have developed into showing affection and affiliation between equals.

Adult chimpanzee baring teeth

Adult chimpanzee baring teeth

Laughter is the best medicine

It’s also likely that our laughter evolved from another primate expression: the ‘play face’. This facial expression can be seen during playful encounters. For instance, a flash of teeth reassures a gorilla’s playmate that they do not intend to harm them. This appears to be a foundation of human laughter

Young chimpanzee showing prototypical 'play face'

Young chimpanzee showing prototypical 'play face'

It’s easy to imagine that all animals smile and show happiness just like us. Today, they can! For when you’re smiling, the whole (natural) world smiles with you…

Painted turtle (Chrysemys picta)

Belize crocodile (Crocodylus moreletii)

Snake-eyed lizard (Ophisops elegans)  

Photo of bottlenose dolphin (Tursiops truncatus)

 

 

 

 

 

 

 

Happy World Smile Day!

  • Homa (October 5th, 2012 at 4:52 pm):

    Wish everyday to be smile day for ARKIVE!!

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