In Star Control 3 the Harika & Yorn are two alien races who evolved on the same world as predator and prey respectively. In their modern society they have evolved a symbiotic relationship with the warlike reptilian Harika eating the Yorn which serves to control the Yorn's population numbers. They also gain the advice of their somewhat more diplomaticly minded food. The Yorn resemble Star Trek tribbles and as such would not be capable of a technological society on their own; the Harika grant them this chance. At the start of the game they are members of the Crux and suffering from the Xchagger virus; they are recruitable by the player via the curing of this virus.