High Quality Content by WIKIPEDIA articles! Caddo is the only surviving Southern Caddoan language of the Caddo language family. It is spoken by the Caddo Nation of Oklahoma. Today, only 25 elderly speakers are estimated to remain, none of whom are monolingual Caddo speakers, making Caddo a critically endangered language. There are several mutually intelligible dialects of Caddo; some of the more prominent dialects include Kadohadacho, Hasinai, Hainai, Natchitoches, and Yatasi. Today, the most commonly used dialects are Hasinai and Hainai. Caddo is linguistically related to the members of the Northern Caddoan language family; these include the Pawnee-Kitsai (Keechi) languages (Arikara, Kitsai, and Pawnee) and the Wichita language. Kitsai is now extinct, and Pawnee, Arikara, and Wichita each have fewer surviving speakers than Caddo does. Another language, Adai, is postulated to have been a Caddoan language while it was extant, but because of scarce resources and the language’s extinct status, this connection is not conclusive, and Adai is generally considered a language isolate.