Dolphins ‘smile’ at playmates to stop misunderstandings - The Times
- Dolphins ‘smile’ at playmates to stop misunderstandings The Times
- Watch: Bottlenose dolphins ‘smile’ at each other while playing The Independent
- Dolphin 'smiles' may truly be a sign of playfulness New Scientist
- Dolphins’ "Smile" Reveals Playful Intentions Neuroscience News
- Dolphins’ open-mouth behaviors during play are like smiles, a study claims Science News Magazine