Chinantecan languages
The Chinantec or Chinantecan languages constitute a branch of the Oto-Manguean family. Though traditionally considered a single language, "Ethnologue" lists 14 partially mutually unintelligible varieties of Chinantec. The languages are spoken by the indigenous Chinantec people who live in Oaxaca and Veracruz, Mexico, especially in the districts of Cuicatlán, Ixtlán de Juárez, Tuxtepec and Choapan, and in Staten Island, New York. Internal classification. Egland and Bartholomew (1978) established fourteen Chinantec languages on the basis of 80% mutual intelligibility. "Ethnologue" found that one that had not been adequately compared (Tlaltepusco) was not distinct, but split another (Lalana from  Tepinapa). At a looser criterion of 70% intelligibility, Lalana–Tepinapa, Quiotepec–Comaltepec, Palantla–Valle Nacional, and geographically distant Chiltepec–Tlacoatzintepec would be languages, reducing the count to ten. Lealao Chinantec (Latani) is the most divergent. Phonology. Chinantecan languages have ballistic syllables, apparently a kind of phonation. All Chinantec languages are tonal. Some, such as Usila Chinantec and Ojitlán Chinantec, have five register tones (in addition to contour tones), with the extreme tones deriving historically from ballistic syllables. Grammar. Grammars are published for Sochiapam Chinantec, and a grammar and a dictionary of Palantla (Tlatepuzco) Chinantec. Example phrase: The parts of this  sentence are: "ca¹" a prefix which marks the past tense, "dsén¹" which is the verb stem meaning "to pull out an animate object", the suffix -"jni" referring to the first person, the noun classifier "chi³" and the noun "chieh³" meaning chicken. Whistled speech. The Chinantec people have practiced whistled speech since the pre-Columbian era. The rhythm and pitch of normal Chinantec speech allow speakers of the language to have entire conversations only by whistling. The sound of whistling carries better than shouting across the canyons of mountainous Oaxaca. It enables messages to be exchanged over a distance of up  to . Whistled speech is typically only used by Chinantec men, although women also understand it. Use of the whistled language is declining, as modern technology such as walkie-talkies and loudspeakers have made long-distance communication easier. Media. Chinantec-language programming is carried by the CDI's radio stations XEOJN, broadcasting from San Lucas Ojitlán, Oaxaca, and XEGLO, broadcasting from Guelatao de Juárez, Oaxaca.