Usila Chinantec
Usila is a Chinantec language of Mexico. It is most similar to Tlacoatzintepec Chinantec, with which it has 50% intelligibility.
Like other Chinantec and Mazatec languages, Usila Chinantec is a tonal language noted for having whistled speech. Its tone system is unusually detailed, however, with five register tones.
