Coatlán Zapotec (Western Miahuatlán Zapotec) is a Zapotec language spoken in southern Oaxaca, Mexico. It uses linguolabial sounds as onomatopoeia.
It is also known as San Miguel Zapotec and Zapoteco de Santa María Coatlán, to distinguish it from Zapoteco de San Vicente Coatlán. It is the only language that uses the linguolabial click. However, it is only used for onomatopoeias.
References
Sources Beam de Azcona, Rosemary G. 2004. A Coatlán-Loxicha Zapotec Grammar. Ph.D. dissertation. University of California, Berkeley.
External links AILLA resources for Coatlán-Loxicha Zapotec
Dr. Beam de Azcona on Coatlán-Loxicha Zapotec (Spanish and English)