An anonymous reader shares a report: Tourists visiting La Gomera and El Hierro in the Canary Islands can often hear locals communicating over long distances by whistling — not a tune, but the Spanish language. “Good whistlers can understand all the messages,” says David Diaz Reyes, an independent ethnomusicologist and whistled-language researcher and teacher who lives in the islands. “We can say, ‘And now I am making an interview with a Canadian guy.'” The locals are communicating in Silbo, one of the last vestiges of a much more widespread use of whistled languages. In at least 80 cultures worldwide, people have developed whistled versions of the local language when the circumstances call for it. To linguists, such adaptations are more than just a curiosity: By studying whistled languages, they hope to learn more about how our brains extract meaning from the complex sound patterns of speech. Whistling may even provide a glimpse of one of the most dramatic leaps forward in human evolution: the origin of language itself.
Whistled languages are almost always developed by traditional cultures that live in rugged, mountainous terrain or in dense forest. That’s because whistled speech carries much farther than ordinary speech or shouting, says Julien Meyer, a linguist and bioacoustician at CNRS, the French national research center, who explores the topic of whistled languages in the 2021 Annual Review of Linguistics. Skilled whistlers can reach 120 decibels — louder than a car horn — and their whistles pack most of this power into a frequency range of 1 to 4 kHz, which is above the pitch of most ambient noise. As a result, whistled speech can be understood up to 10 times as far away as ordinary shouting can, Meyer and others have found. That lets people communicate even when they cannot easily approach close enough to shout. On La Gomera, for example, a few traditional shepherds still whistle to one another across mountain valleys that could take hours to cross.
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