 Specialists studying the past of the Tusken Raiders also used the term Ghorfa to denote an earlier sedentary phase of their culture, and lastly Kumumgah, for the earliest stratum of sentient civilization on the planet, believed by some to represent a common ancestry shared by the Ghorfas (the Tuskens) and the Jawas.Twi'leks are humanoids easily distinguished by the twin tentacular appendages that protrude from the back of the head.These prehensile appendages, known as "head-tails", "lekku" or "tchun-tchin," are advanced organs used for communication and cognitive functions (similar to those of Togrutas).