query: What language is mainly spoken in Turkey?
passage: Languages of Turkey
The languages of Turkey, apart from the only official language Turkish, include the widespread Kurmanji, the moderately prevalent minority languages Arabic and Zazaki and a number of less common minority languages, some of which are guaranteed by the 1923 Treaty of Lausanne.
passage: Turkish language
In the Turkish province of Giresun, the locals in the village of Kuşköy have communicated using a whistled version of Turkish for over 400 years. The region consists of a series of deep valleys and the unusual mode of communication allows for conversation over distances of up to 5 kilometres. Turkish authorities estimate that there are still around 10,000 people using the whistled language. However, in 2011 UNESCO found whistling Turkish to be a dying language and included it in its intangible cultural heritage list. Since then the local education directorate has introduced it as a course in schools in the region, hoping to revive its use.