The Hadza, or Hadzabe, are a Tanzanian indigenous ethnic group mostly based in southwest Karatu District of Arusha Region. Genetically, the Hadzabe are not closely related to any other people. Once classified among the Khoisan languages, primarily because it has clicks, the Hadza language (Hadzane) is actually thought to be an isolate, unrelated to any other. Hadzane is an entirely oral language, but it is not predicted to be in danger of extinction. UNESCO states that the language is not endangered but vulnerable because most children learn it but the use is restricted to certain areas of life, for example to the home