dolphin
![](https://cdn.abcotvs.com/dip/images/15394081_100424-cc-cnn-dolphin-smiling-courtesy-img.jpg?w=660&r=16%3A9)
Dolphins 'smile' at each other when they play, study says
For humans, flashing a smile is an easy way to avoid misunderstanding. And, according to a new study, bottlenose dolphins may use a similar tactic while playing with each other.
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