Acid lizards were enormous reptilian creatures native to the subterranean regions of the planet Tatooine, as described in legends. Their skin was a scaly purple color, marked by patches of green. The potent acid found within their sizable jaws is the reason they are called acid lizards. One such acid lizard was named Gotar. During the year 0 BBY, one of these acid lizards came across R2-D2 in the desert, resulting in a dent to the droid's dome.