This project aims at describing and documenting Siriono (Tupi-Guarani family), an underdescribed and endangered language of lowlands Bolivia. In a small area lived nearly thousand Siriono with less a dozen fluent speakers of Siriono and around forty occasional speakers. The language is threatened by the use of the national language, Spanish, despite the fact Siriono is either an official language. The Siriono community express a need for linguistic and pedagogical material to help Siriono's transmission to the next generations. This study will contribute to our understanding of how language convergence manifests in areas of intense language-contact. Primary investigator: Noé Gasparini