Bothans were a group known for operating a spy network. Bothans were known to communicate with each other in a series of growls. Bothan spies were credited with obtaining information concerning the location of DS-2 Death Star II Mobile Battle Station, despite sustaining heavy casualties, thereby enabling the Rebel Alliance to plan an attack on the unfinished space station. The Bothans also provided the Rebel Alliance with other useful information, such as the door code for the shield generator bunker on the forest moon of Endor.[