The Trill symbiont is a vermiform lifeform. It is transferred from one Trill humanoid to another upon the death of the host. The symbiont takes with it all memories of the previous Trill hosts. Upon joining, the new Trill host will gain these memories. The Symbionts live in Caves of Mak'ala on Trill and are cared for by the Guardians. They communicate with each other via electrical impulses transmitted through the milky water they live in.