Tags: 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 numbers about 150.The language is unclassified with no known connections to established families. It is neither Tupian nor Arawakan. Four people remembered the language in 2001 and two in 2008 but none were fluent speakers.