Deep in the Pacific, humans have tracked a mysterious whale’s call for decades—but no other whale seems to respond. And now, we might be running out of time to find the source.

Adrián Simancas was paddling off the Patagonian city of Punta Arenas on Saturday when the giant baleen whale surged out of ...

striped dolphins and bearded whales while the beginning of spring is great for blue whales, sei whales and fin whales. Because so many cetaceans live and pass through these waters, the probability ...