Krayt dragons

Krayt dragons are fictional animals germaine to the continuity of the Star Wars film franchise. They have never actually been seen in any of the films, but have made appearances throughout the Expanded Universe. The skeleton of a Krayt dragon was briefly seen in a scene that was originally deleted from the theatrical release of Star Wars Episode IV: A New Hope, but was re-inserted in later home video releases of the film as well as the 1997 theatrical re-release. The skeleton can be seen in the first half of the film when C-3PO is trekking across the Dune Sea. Later in the film, Obi-Wan Kenobi imitates the howl of a Krayt dragon in order to scare off a group of Sandpeople that had been attacking Luke Skywalker. The sound he makes was identified as a Krayt dragon call in the Star Wars novelization written by Alan Dean Foster.

Krayt dragons are large reptilian animals indiginous to the planet Tatooine in the Tatoo system.