Ssi-ruuvi
From Wookieepedia, the Star Wars wiki.
Ssi-ruuvi was the language used by the Ssi-ruuk for planet Lwhekk. It could not be reproduced by Humans, who did not possess the organs needed to do so.
It was formed by melodic clicks and whistles. When spoken it was considered similar to the sound of a flute, which caused the Ssi-ruuvi to be nicknamed "Fluties".
It was rare for a Ssi-ruuk to learn other languages, preferring to use translators. As Ssi-ruuvi was not a very extended language, only their own translators were fluent in both Ssi-ruuvi and Basic
