Betelgeusian
- Appearance: Avian
- Blue skin (TOS Novel: Ex Machina)
- Brown muzzle (TOS Novel: Ex Machina)
- Two mouths (TOS Novel: Ex Machina)
- Beak-like speaking mouth (TOS Novel: Ex Machina)
- Lower eating mouth (TOS Novel: Ex Machina)
- Homeworld: Unnamed planet near Betelgeuse (TOS Novel: Ex Machina)
- Departed homeworld upon discovery of Betelgeuse's coming supernova in the near future, residing instead on interstellar argosies (TOS Novel: The Face of the Unknown, Ex Machina; TNG Novel: The Buried Age)
- Cultural notes
- Language
- Tonal language (TNG Short Story: "Friends with the Sparrows")
- Language