The government also raised the status of Silbo Gomero by selecting the whistled language of La Gomera via the National Historical Heritage Council to represent Spain in the nominations for inclusion on the 2009 Representative List of the Intangible Cultural Heritage of Humanity.
22.
"All whistled languages share one basic characteristic : they function by varying the frequency of a simple wave-form as a function of time, generally with minimal dynamic variations, which is readily understandable since in most cases their only purpose is long-distance communication ."
23.
Whistle languages have naturally developed in response to the necessity for humans to communicate in conditions of relative isolation, with possible causes being distance, noise levels, and night, as well as specific activities, such as social information, shepherding, hunting, fishing, courtship, or shamanism.
