Dewback

Dewbacks were large reptilian animals found in the deserts on the planet Tatooine. They got their name due to the fact that while sleeping, Dewbacks would gather large amounts of dew on their backs that they would later lick off when they woke up in the morning in order to stay hydrated. Several dewbacks were tamed by Imperial Sand Stormtroopers on Tatooine during the Galactic Civil War during their search for the Death Star plans stolen by the Rebel Alliance.