Mato Grosso Arára language
Mato Grosso Arára (also disambiguated as Arara do Beiradão or Arara do Rio Branco, and also known as Koaiá ~ Koayá) is an extinct unclassified language of Brazil. The ethnic population that spoke the language numbers about 150.
The language is unclassified, with no known connections to established families. It is attested in a single word list, which shows it is neither Tupian nor Arawakan. Four people remembered the language in 2001, and two in 2008, but none were fluent speakers. 
- Arara do Rio Branco word list
- Lev, Michael; Stark, Tammy; Chang, Will (2012). "Phonological inventory of Arára do Mato Grosso". The South American Phonological Inventory Database (version 1.1.3 ed.). Berkeley: University of California: Survey of California and Other Indian Languages Digital Resource.
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