Vilosorian The Vilosorians were a sentient species native to the Mid Rim planet Vilosoria . Their bodies followed a seasonal cycle , metamorphosizing into powerful carnivores with the onset of the warm seasons . During the Galactic Civil War , the Vilosorians were able to repel the Imperial presence from their world with the intervention of Rebel agents who delayed Imperial reinforcements . Their homeworld was later within the territory of Imperial Admiral Treuten Teradoc ' s Greater Maldrood . Biology and appearance . The Vilosorians were a sentient species from the planet Vilosoria . Their physique matched the seasonal cycles of their homeworld ; consequently , during the cold months of their year , they were docile and calm , but with the onset of the warm seasons , the Vilosorians metamorphosized into powerful carnivores . History . Early history . The Vilosorians evolved on the planet Vilosoria , located within the Lifh sector , a portion of the Mid Rim within The Slice . Their planet was situated between the Perlemian Trade Route and the Lesser Lantillian Route , within the general region of space being explored by the Galactic Republic during the Great Manifest Period , circa 20 , 000 – 15 , 000 BBY . During the Jedi Civil War , circa 3959 BBY , their planet fell within the territory controlled by Darth Revan ' s Sith Empire ; however , they were within Republic space during the New Sith Wars of 1000 BBY . During the Clone Wars , Vilosoria fell within territory contested between the Republic and the separatist Confederacy of Independent Systems . Galactic Empire and beyond . Following the Clone Wars , the Republic transitioned into the Galactic Empire . The Empire briefly invaded Vilosoria , establishing a garrison of troops on the planet , with support provided by the Immobilizer 418 cruiser " Fireclaw " . Prior to the Battle of Yavin , R2z - DL , an R2z Starship Maintenance Droid working as an agent of the Rebel Alliance , intercepted information on the Imperial supply lines in Lifh sector , along with the " Fireclaw " patrol routes and maintenance record . R2z - DL passed this information on to Rebel agent Koedi Raef , together with information on the seasonal cycles of the Vilosorians . With that information , Raef coordinated a delay in the " Fireclaw " arrival to the Vilosoria system with that of the planet ' s warm season . That provided an opportunity for the Vilosorians — then metamorphosized into their carnivorous form — to attack the local Imperial garrison and drive them offworld . Despite the Vilosorians ' local success , Vilosoria remained within a zone of Imperial control from 4 – 8 ABY ; known as the Greater Maldrood , the area was controlled by Imperial Admiral Treuten Teradoc , until he was defeated by the New Republic circa 9 ABY . Behind the scenes . The Vilosorians were created by Chuck Truett for " Cracken ' s Rebel Operatives " , published by West End Games in 1994 . They later received a mention in " The Complete Star Wars Encyclopedia " , published in 2008 , which provided some new information not in the original source . In 2009 , " The Essential Atlas " placed their homeworld and consequently provided further information on the general history of the species and planet .