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.