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- "Oh, yes. Wormheads. Twin tendrils off head. Females much yum-yum."
- ―Vilmarh Grahrk
The lekku protruded down the back of the skull and contained part of a Twi'lek's brain. A Twi'lek's braintails served many purposes in their daily lives and culture, storing fat and other qualities. The Twi'lek's native language of Twi'leki was spoken using a combination of words and subtle movements of the lekku.
A Twi'lek's brain tails were highly sensitive, and grabbing them forcefully was so painful that it could easily incapacitate almost any Twi'lek. Despite this, some Twi'leks would cover their lekku with elaborate tattoos;[source?] alternatively, they would be glitter-painted. Since the top portion of the lekku near the head housed parts of a Twi'lek's brain, damage to this part of the brain tails also caused lasting brain damage, since the tissue within governed basic motor functions, as well as housing repressed subconscious memories.
They could be bent around the neck or shoulders in varying combinations for aesthetic purposes, more or less compared to how Humans cultivate and arrange the shape of their hair.
Long or multiple lekku were considered great status symbols, and often went hand in hand with respect, influence and wealth. A Twi'lek's braintails could be likened to phallic symbols,[source?] and for both sexes larger lekku brought with them some indistinct positive connotations. Most male Twi'leks had longer lekku than the average females. Males also featured large bumps on their brows above each eye. The brow deposits on some truly corpulent males developed into a second set of anterior lekku. Such individuals were common in the aristocracy of Ryloth. On their homeworld, both the increased weight and the extra lekku were signs of wealth and status.
Their braintails were a source of great pride to Twi'leks, especially when confronted by other species. The name "tchun-tchin" actually referred to each lekku—tchun being left lek while tchin was the right. In casual conversation the Twi'leks would usually refer to their lekku as "tchun" or "tchin".
Togrutas also sported head-tails. This species, however, had three (rarely four) head tails, the two at the side of the head and one from the lower-back of the skull. The stripes on their lekku would become more or less vibrant according to their emotions such as getting embarrassed. Togrutans' native language of Togruti was similar to Twi'leki in the fact that both languages involved the use of the head-tails.
Combined with their head-tails, Togrutans also had two hollow montrals which could ultrasonically detect objects. These montrals, along with their three head-tails, did not grow fully until adolescence. A Togruta's head-tails were generally longer than a Twi'lek's and were draped forward due to the third head-tail in the back.
- The Star Wars Sourcebook (As "head-tails")
- Galaxy Guide 7: Mos Eisley (As "head-tail")
- Star Wars Sourcebook, Second Edition (As "head-tails")
- Galaxy Guide 11: Criminal Organizations (As "tentacles")
- Shadows of the Empire Sourcebook
- The Essential Guide to Alien Species
- Ultimate Adversaries
- Star Wars: Lethal Alliance
- "Who's Who in the Delegation of 2000"—Star Wars Insider 85
- Star Wars Roleplaying Game Saga Edition Core Rulebook
- The Force Unleashed Campaign Guide
- Star Wars Character Encyclopedia
- Star Wars: Edge of the Empire Core Rulebook
- (Picture only)
- (as "prehensile tentacles")