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New Research Reveals That Dolphins “Smile” To Signal for Playtime

Study: Bottlenose Dolphins ‘Smile’ at Each Other during Their Playful Interactions

Bottlenose dolphins 'smile' at each other while playing

Bottlenose dolphins “smile” at each other while playing - EurekAlert

Bottlenose dolphins “smile” at each other while playing - EurekAlert

Robots Get a Fleshy Face (and a Smile) in New Research