You can help expand this article with text translated from the corresponding article in Portuguese. (October 2020) Click [show] for important translation instructions. View a machine-translated version of the Portuguese article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 516 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Portuguese Wikipedia article at [[:pt:Língua arara do Rio Branco]]; see its history for attribution. You may also add the template {{Translated|pt|Língua arara do Rio Branco}} to the talk page. For more guidance, see Wikipedia:Translation.

Mato Grosso Arára (also disambiguated as Arara do Beiradão or Arara do Rio Branco, and also known as Koaiá ~ Koayá or Yugapkatã^[1]) 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.^[2]

Jolkesky (2010) notes some lexical similarities with Tupian.^[3]

The following vocabulary list was collected in 2011 by Inês Hargreaves from two Arara groups in the north of the Parque Aripuanã, Rondônia. The informants were João Luis V. Arara, José Rodrigues V. Arara, Maria Aruy Arara, and Ana Anita Arara.^[4]

For a more extensive vocabulary list of Arara by Jolkesky (2010),^[5] see the corresponding Portuguese article.

Wiktionary has word lists at Appendix:Mato Grosso Arára word lists

• 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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