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Besides spoken language, some populations in different parts of the world use a complementary system of vocal communication, which is based on modulated whistles and thus called 'whistled language'. Whistled languages can be regarded as a transposition of a given local language into a repertoire of whistles. Almost any language (non-tonal, tonal or accent-pitch) could be whistled and nearly anything can be expressed this way. Such adaptations have been used by various cultures, mainly in response to a specific ecological situation: a certain isolation of individuals in their everyday activities. Therefore they are mostly used in mountains or dense forests.
Reports about whistled languages were documented since the treaty of the Tao in Asia (6th century B.C.) and since the 17th century in the island of La Gomera (Canary Islands). First studies concerned mainly anthropological aspects (Quedenfeldt 1887, Lajard 1891, Labouret 1923, Eboué 1935), whereas later investigations also included linguistic (Cowan 1948, Classe 1956) and acoustical issues (Busnel 1966, 1970b). Today, twelve whistled languages have been partially described and studied linguistically or bioacoustically (see Sebeok and Umiker-Sebeok 1976). In addition, as many as sixty other languages are suspected to still have a whistled equivalent, but these have not been studied yet.
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