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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. As far as deep-sea ...

On a bright-blue morning in July, 2023, a team of researchers took off in a catamaran from the island of Dominica in search of sperm whales. Sperm whales communicate via bursts of clicks, called codas ...