can monkeys really smile?
http://www.sandiegozoo.org/animalbytes/t-monkey.html Grinning, or pulling the lip up to show the teeth, may seem like a smile to us. But for monkeys this is a sign of aggression or anger, because biting is one way monkeys fight and defend themselves. Other signs of aggression include head bobbing, yawning (again, to show the teeth), and jerking the head and shoulders forward. |
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