Tibannuck

Tibannucks were creatures native to Bespin which looked inane and primitive but were in fact very intelligent. The fed on the rare Tibanna gas in the skies of Bespin and had four huge lungs which were sparated into two sections, the first of which took in the gas while the second spread it througout their bodies. Tibannucks were often caught in the core of Cloud City where the mining machinery killed them. There was a 2,000 credit reward for the death of the Tibannuck queen mother.

Behind the scenes
Tibannucks were created by Nathaniel Gabor, a Star Wars fan, as part of the Design An Alien contest held in the Star Wars Galaxy Magazines. The entry was picked as the third place winner in the under 16 years old category but it is not known exactly how canon the creature is.