Gabriel Melo-Santos studies Araguaian river dolphins in Brazil — his work has revealed that the species is much chattier than we'd previously known, and could potentially help us better understand the evolution of underwater communication in marine mammals. He plays some of the recordings he's made of the dolphins, explains how he managed to study the elusive creatures thanks to their fondness for a certain riverside fish market, and discusses how the study of their vocalizations could yield insights into how their sea-faring relatives use their own calls to maintain social cohesion.

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