Parapontoporia, an extinct genus of long-snouted dolphins that lived off the Pacific coast of North America from the Late Miocene epoch until the Pliocene, was likely to have been able to hear within narrow-band high frequency ranges, according to a new analysis of Parapontoporia’s bony labyrinth. Qiqi, the last confirmed Chinese river dolphin. Image credit: Roland Seitre / CC BY-SA 3.0. “Whales, dolphins, and porpoises (cetaceans) embody one...
