This collection will contain documentation of five of the most urgently endangered native languages of Brazil, which are under-researched as of yet. These languages are: Mondé, Puruborá, Mekens, Ayuru, and Xipaya. These five languages belong to the lesser-known branches of the Tupi family. Only two have received prior intensive research and none has adequate documentation available. This collection was started with the following general objectives: To salvage the maximum information about the language and about the traditional culture expressed through the language; to make this information widely available for the community and for science, while respecting the wishes and rights of the native communities; to establish reference grammars, dictionaries, collections of texts, and extensive and varied digitalized and annotated recordings; to prepare practical language materials and copies of the recordings and transcriptions for the language communities.