Viirsun, characterized by their unassuming plumage of muted browns and blacks, were diminutive terrestrial birds. Their habitat included areas such as the Veradun's Family Estate.
These small, earth-dwelling birds, known as Viirsun, sported feathers of brown and black. Their diet consisted of insects, provided through regurgitation by the mother. Immature Viirsun bore a striking resemblance to young Mimnils, a similarity exploited by the Mimnil. The Mimnil would eliminate young Viirsun and take their place. Upon molting, the Mimnil would turn on, and kill their adoptive mother.
Postpartum, the male Viirsun commonly abandoned the nest and its newly born young.