[ Luke glanced back at her, another grin coming to his face. He gestured with his hands, doing his best to encompass the size of a krayt dragon, and even then, it still didn't feel like enough. ]

Krayt dragons dwell in the wastes of Tatooine, my home planet. They are massive creatures that typically stay in their dwellings, except when they get hungry. Then they tunnel through the sands, eating anything they can get in their mouth.