Pui - ui The Pui - ui species ( ) was native to Kyryll ' s World . The sentients ' small bodies were formed by two spheres separated by a short neck . The lower of the two spheres had a number of cilia projecting from it , facilitating movement . The species was active in the galaxy in the early years of the Galactic Empire , with luxury facilities on the University of Rudrig campus and with their medical data programmed into 2 - 1B surgical droids . Biology and appearance . Pui - uies were a small sentient species native to a planet known as Kyryll ' s World , located in the Phelleem sector of the Outer Rim Territories . They resembled two spherical bodies separated by a 0 . 5 - meter - long neck and could grow up to 1 . 25 meters in height . The bottom - most sphere had numerous cilia projecting from its base , which provided the species with locomotive capabilities . Pui - ui reproduced hermaphroditically , and were known to hibernate . They had three hearts , and the entire species was fatally allergic to perigen , a common non - narcotic pain killer . Pui - uies spoke a language composed of a wide range of shrill sounds . History . The Pui - ui were known in the galaxy from at least 671 BBY . At that time , they were included in " Evocar " , a play written by the Hutt Direus ' Pei , which dramatized the conquests of Xim the Despot . They were also active in the galaxy in the early days of the Galactic Empire . The Tion Hegemony ' s sole university , the University of Rudrig , had a number of luxury dermal autostripper services available for Pui - ui , as well as for members of the Lisst ' n species , who were known for continually shedding their skin . Pui - ui medical data was also programmed into the 2 - 1B surgical droids designed by Industrial Automaton and Geentech ; the droids were able to diagnose enzyme eruptions in Pui - uies ' third hearts , and administer doses of Iotramine and Clondex , or insert Intravenous Access Unit catheters to deal with the condition . Behind the scenes . The Pui - ui were first mentioned in " Han Solo and the Lost Legacy " , a Brian Daley novel published by Del Rey in 1980 . This throw - away mention revealed little about the species ; however , in 1984 , the species was given an entry in " A Guide to the Star Wars Universe " by Raymond L . Velasco which provided some description and background for the species . Their entry was largely repeated in the second edition published in 1994 , although with some interesting changes . For instance , mention of their hermaphroditic reproduction was dropped , and " a 0 . 5 meter long neck " was changed to " a short neck " — possibly attributable to a confusion over the metric system , as hypothesized by Abel Peña . The only other source of original material on Pui - uies is in " The Essential Guide to Droids " , written by Daniel Wallace and published in 1999 . The capitalization of the name of the species has differed across sources , with no clear consensus emerging . Originally , " Han Solo and the Lost Legacy " capitalized it " Pui - Ui , " which was retained for the first edition of " A Guide to the Star Wars Universe " — although at one point it also used " pui - uies " — as well as for " The Essential Guide to Droids " . However , the capitalization changed to " Pui - ui " for the second and third editions of " A Guide to the Star Wars Universe " , and for the " Star Wars Encyclopedia " . Finally , the most recent publication , " The Complete Star Wars Encyclopedia " , capitalized it both as " Pui - Ui " and " Pui - ui " in its entries for Kyryll ' s World and for the species itself , respectively .