Krayt dragon/Legends

Krayt Dragons are huge dragons that are native to the remote planet Tatooine. They are very tall, as C-3PO walks by a huge skeleton of one in Star Wars Episode IV A New Hope. They are also very much feared by Tusken Raiders. Obi-Wan Kenobi imitated a Krayt Dragon's call to scare away the Tuskens that were attacking Luke Skywalker.