Leyron
The Leyron were a species native to the planet Malkus IX.

They were considered unique as they were one of few known species to have developed a written language significantly before developing a spoken or sign language. ()  

Kathryn Janeway once studied the gestural idioms of the Leyron, which she found more comprehensible than the non-verbal language of the Tak Tak. ()

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Species