Why don't monkeys and nonhuman primates smile when they get happy or amused?

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caltam84

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I do know that chimps might smile not because of happiness, but they could show their teeth that they are frightened or other reasons.

And yet, it seems that humans are the only animals that smile when amused or happy.
 
Bonobos do. The source below (p 33) provides some interesting discussion on the topic.
 
Bonobos do. The source below (p 33) provides some interesting discussion on the topic.
 
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