Hiaki, also known as Yaqui, is a language spoken by the Hiaki people of southern Arizona and northern Mexico. It belongs to the Uto-Aztecan language family and is considered an endangered language with fewer than 20,000 speakers. Hiaki is known for its rich morphology and complex verb system. Research on Hiaki language typically focuses on documenting and preserving the language, as well as studying its grammar, syntax, and phonetics. Additionally, there is ongoing research on language revitalization efforts and language education programs to ensure the survival of Hiaki for future generations.