Caddo is the only surviving Southern Caddoan language of the Caddo language family. It is spoken by the Caddo Nation of Oklahoma. By 2009, only 25 elderly speakers were estimated to remain, none of whom were monolingual Caddo speakers, which made Caddo a critically endangered language. Caddo has several mutually intelligible dialects; some of the more prominent dialects include Kadohadacho, Hasinai, Hainai, Natchitoches, and Yatasi. Today, the most commonly used dialects are Hasinai and Hainai.