Dolphins perform at the SeaWorld marine life theme park, on Yas Island in Abu Dhabi on May 21, 2023. — File Photo by Karim SAHIB/AFP
"Smile and the whole world smiles with you," goes the expression – and it seems the same is true for bottlenose dolphins.
The brainy marine mammals use friendly facial signals to signal non-hostile intent to playmates, who respond in kind, a study in the journal iScience said Wednesday – similar to visual cues used by humans.
