Dahalo language
Dahalo is an endangered Cushitic language spoken by at most 400 Dahalo people on the coast of Kenya, near the mouth of the Tana River. Dahalo is unique in the world in using all four airstream mechanisms found in human language.
Overview
The Dahalo, former elephant hunters, are dispersed among Swahili and other Bantu peoples, with no villages of their own, and are bilingual in those languages. It may be that children are no longer learning the language.
Dahalo has a highly diverse sound system using all four airstream mechanisms found in human language: clicks, ejectives, and implosives, as well as the universal pulmonic sounds.
In addition, Dahalo makes a number of uncommon distinctions. It contrasts laminal and apical stops, as in languages of Australia and California; epiglottal and glottal stops and fricatives, as in the Mideast, the Caucasus, and the American Pacific Northwest; and is perhaps the only language in the world to contrast alveolar lateral and palatal lateral fricatives and affricates.