Whistled Tongues of the Ravines: The Silbo Gomero

A question about the ferry sits in a schoolbook beside its whistled spelling. On one side is ordinary Spanish: what time does it leave? On the other, the same question has been transposed into the sounds of Silbo Gomero. A pupil learning from the Canary Islands’ 2005 manual is learning to send a practical sentence through a whistle.^[3]

The setting is La Gomera, a volcanic island in the Canary Islands, with steep valleys opening towards the Atlantic. Whistled Spanish let people communicate across that broken ground. A message could take a route through the air while the person sending it remained on the opposite slope.^[10][2]

Much of ordinary speech’s sound is missing from the whistle, yet trained listeners can recover the words. The puzzle involves more than a clever acoustic shortcut. A community has to know how to make the sounds, how to listen and when to ask again. When that knowledge stopped passing readily from adults to children, people on La Gomera put it into lessons.^[5][2]

The mouth becomes the instrument

Isidro Ortiz Mendoza is named among the teachers who helped bring Silbo into La Gomera’s schools. The manual gives the body a practical syllabus: tongue, jaw, lips, fingers, hands and air. Before a pupil can send a sentence, they have to produce a usable whistle. Placing a finger and closing the lips around it are skills that can be shown, tried and corrected.^[3]

Ordinary voiced speech contains several frequency bands at once. A whistle concentrates the signal into a much narrower band, using changes in pitch and interruptions to preserve selected information. The listener receives fewer acoustic details than in an ordinary spoken sentence, but those remaining details still belong to the language being whistled.^[5]

The movements are therefore essential. A sustained pitch alone would not supply the changing pattern of a message. The line can rise, fall, stop and begin again, making contrasts available to the listener. UNESCO’s description distinguishes sounds by pitch and by whether they continue or break, rather than treating Silbo as one unchanging note.^[2]

Linguist Annie Rialland identifies loudness changes as part of that organisation too. They help define boundaries and distinguish classes of sounds. Pitch is central, but the whistle’s timing and interruptions also carry structure. A listener is following a shaped signal, not simply identifying the highest or lowest sound in isolation.^[6]

That structure is specific to its source language. Whistled Spanish and whistled Turkish do not automatically become mutually understandable because both use whistles. Each retains selected patterns from its own language. Julien Meyer’s research describes whistling as a complementary form of speech, with skilled listeners able to understand sentences through a strongly reduced sound spectrum.^[5]

A father calls, a child understands

One person interviewed for the teaching manual remembered a father whistling the children’s names to call them home. The speaker understood the calls but never learned to whistle back. That small admission separates two abilities often gathered under “knowing Silbo”: understanding a message and making one.^[3]

Others recalled learning through daily exposure, with relatives or neighbours helping when a child struggled to position the tongue or finger. Practice belonged to ordinary encounters. The child who heard a familiar call already had some knowledge of what was likely to be said, even before gaining control of the mouth movements.^[3]

In the account accompanying UNESCO’s 2009 inscription, almost all islanders understood Silbo, while a large part of the community practised it. The qualification matters: understanding was widespread, not universal. Nor should a description prepared for an inscription become an undated census of every resident’s ability.^[2]

The everyday messages included news of births and deaths, missing animals and requests connected with work. The University of Washington’s account gives such examples as getting a gate opened or reporting a stray sheep. These are messages with a purpose and a likely answer, rather than a collection of sounds produced only for display.^[4]

Context helps the listener recover what has been left out acoustically. Familiar circumstances and shared knowledge narrow the possibilities. If the message remains unclear, another exchange can repair it. David Corina emphasised that role of context in the study of Gomeran whistlers; successful communication involves the people listening as well as the signal travelling between them.^[4]

The manual gives a compact example of the problem: nada, lana, llano and roña can sound alike when whistled. Their meanings in ordinary Spanish are quite different. Surrounding words and the subject of a conversation help the listener choose among them. An isolated signal offers fewer clues than a sentence exchanged between people who know what they are talking about.^[3]

That is why a reduced set of contrasts need not imply a reduced range of thoughts. UNESCO describes skilled whistlers as able to convey messages beyond a fixed code of commands. The system follows Spanish, while conversation supplies opportunities to clarify which Spanish words are intended.^[2]

An old practice with an uncertain beginning

A passage in Le Canarien describes islanders’ speech in terms later writers associated with whistling. The manual treats it as an early clue, while warning that the practice’s origins remain uncertain. Accounts linking it to pre-Hispanic inhabitants should keep that difference between a plausible inheritance and a demonstrated route of transmission.^[3]

Later explanations sometimes turned the whistle into a story about people deprived of their tongues. Such tales tried to account for an unfamiliar practice through punishment and bodily loss. They do not establish how Silbo began. The actual craft uses the tongue, lips and other parts of the mouth in controlled ways.^[3]

La Gomera’s history includes conquest and the replacement of earlier languages by Spanish. The later whistled form carries Spanish rather than preserving a complete spoken pre-Hispanic language unchanged. Continuity in a practice can coexist with a change in the language to which it is applied.^[1][10]

University of Washington’s 2005 account repeats the view that North African settlers brought the tradition. That belongs to the history of explanations, not a direct record of an identifiable first whistler’s journey. It is possible to describe how present-day whistled Spanish works more confidently than to reconstruct every stage of its ancestry.^[4]

The distinction also applies beyond the island. Similar ways of carrying speech across distance appear in communities separated by long journeys and different languages. A comparable solution need not demonstrate that one community taught it to another.^[5][8]

When the everyday calls grow fewer

Silbo’s use declined during the later twentieth century as work, migration and communications changed. Telephones could carry messages that had previously crossed a ravine as whistles. Leaving the island also separated learners from the daily encounters through which the practice had been passed on.^[1]

Social judgement mattered too. Reference accounts describe a period when some families associated whistling with poor rural life and did not want children to learn it. A useful skill could become something parents hoped their children would leave behind. Losing occasions to practise and losing esteem could reinforce one another.^[1]

The 2005 manual recognises what that break meant for teaching. Some children arrived at school without the background of hearing Silbo around them. A lesson could not assume that the pupil already knew how a message was divided or which sound belonged to which familiar word. The starting point had changed.^[3]

Older whistlers responded by teaching, including voluntary lessons outside the later compulsory programme. Parent groups helped press for wider instruction. The revival depended on people choosing to make room for practice again, before formal recognition could give it a more secure institutional place.^[1]

UNESCO’s account places school transmission alongside continued use at festivities and ceremonies, including religious occasions. Those uses give the practice more than one setting. A classroom can teach the form, while a community occasion can give people another reason to listen and reply.^[2]

A ravine’s message enters a school timetable

The Canary Islands Parliament called for Silbo to enter La Gomera’s education system in 1997. School teaching followed in 1999. A craft long transmitted through daily use now needed learning goals, assessment and time in a school day. The change brought protection, but also a practical question: how could limited lessons replace much longer exposure at home?^[3][2]

The teaching team included whistlers such as Ortiz and Lino Rodríguez Martín alongside linguists including Ramón Trujillo and Marcial Morera. That combination joined bodily expertise with attempts to describe the system. Someone had to be able to demonstrate a sound; someone also had to decide how a pupil’s progress could be explained and assessed.^[3]

Lessons begin with producing the whistle, then move through words towards simple messages. The teacher supplies a form and the learner tries it back. The process makes error useful: a failed attempt can reveal what needs to change in the mouth or in the pupil’s understanding of the word.^[3]

UNESCO inscribed Silbo Gomero on its Representative List in 2009. Its account highlights transmission between generations and the role of schools. Recognition does not perform the practice on anyone’s behalf; teachers and learners still have to make and interpret the sounds. The protected heritage lives in repeated use.^[2]

Research can depend on the same expertise. Rialland’s acknowledgements name Gomeran teachers and whistlers, including Lino and Angelina Rodríguez and Isidro Ortiz, whose help supported fieldwork. The islanders were participants in the making of linguistic knowledge, as well as people whose speech researchers wanted to describe.^[6]

How many different sounds survive?

The manual’s phrasebook turns papá into kaká and mamá into gagá. Those written renderings show how sounds distinguished in ordinary Spanish can fall together in the whistle. The two columns are teaching aids for a transformation in speech, not Spanish translated into a language with an unrelated vocabulary.^[3]

Trujillo described Silbo through two vowel categories and four consonant categories. His 2006 study defended that analysis, arguing that context and shared knowledge could make listeners seem to perceive more distinctions than the whistle itself carried. That is a named research position, rather than a sound count everyone has accepted in the same way.^[7]

The disagreement concerns how physical differences, meaningful contrasts and a listener’s interpretation relate. Meyer’s 2008 study examined whistled vowels and perception across several communities, drawing attention to selected cues retained from ordinary speech. Its analysis asks how a strongly reduced signal remains intelligible, a question larger than counting letters in a classroom spelling.^[5]

Rialland distinguishes two broad strategies. In whistled forms of non-tonal languages such as Spanish and Turkish, pitch patterns carry selected vowel and consonant information. In tonal languages, whistles can follow the language’s tone melody. The same physical act is shaped by different linguistic material.^[6]

A useful explanation therefore keeps its claims modest. Pitch changes, breaks and loudness differences are real features available to a listener. How they should be divided into a full inventory is a further analytical question. Trujillo’s categories help explain one influential account without closing the discussion of what skilled listeners can distinguish.^[6][7]

A familiar sentence inside the scanner

In 2005, Manuel Carreiras, David Corina and colleagues studied five fluent silbadores and five Spanish speakers who did not understand Silbo. The volunteers listened to recorded sentences and completed tasks involving words for colours or animals. Functional MRI recorded patterns of brain activity while they listened.^[4]

For the whistlers, Silbo engaged regions associated with language, including areas in the left hemisphere and a region in the right temporal lobe. The comparison listeners did not show the same language-related response to the whistles. Familiarity with the system changed how the acoustic material was processed.^[4]

The experiment supports a particular point about experience and the flexibility of language processing. It does not turn one small sample into a map of every whistler’s brain. Nor does learning the skill at home or school decide whether it counts as language. Silbo is recognised as a whistled language whose spoken source is Spanish.^[4][2]

A later study in Kuşköy, Turkey, used a different task. Onur Güntürkün and colleagues played syllables through headphones to people who spoke and whistled Turkish. The usual right-ear advantage for spoken syllables disappeared in the whistled condition. The result challenged a simple assumption that the same hemispheric bias must accompany every form of language.^[9]

Those findings belong to different languages, groups and tests. They offer evidence about how the sound carrying a message can affect its processing, without establishing one universal rule for all whistled speech. The listener brings learned structure to what could otherwise be heard only as an unfamiliar sound.^[9][4]

The ferry question can travel again

Whistled speech is documented far beyond La Gomera. Meyer’s research compares communities with different languages and environments; a 2021 account republished by CNRS describes its use in at least eighty cultures. Similar needs for distant communication have produced a wider family of practices, with different linguistic solutions.^[5][8]

David Díaz Reyes, a researcher and teacher in the Canaries, emphasises that skilled whistlers can convey open-ended messages. His own example in that account concerns an interview happening at that moment. The skill can carry new circumstances, rather than being limited to an inherited list of shepherds’ requests.^[8]

Back in the manual, the ferry question has an ordinary purpose. Someone wants information about a departure. Its whistled form retains enough structure for another person to recognise the question and supply an answer. Teaching the technique makes that small exchange possible again, even for a child who did not grow up hearing it across the valley.^[3][2]

The printed columns cannot make the sound themselves. The page waits for a pupil to position a finger, close the lips and try. Then a line of ink can become a message in the air, with another person’s reply still to come.^[3]