Harika & Yorn

In 'Star Control 3 the Harika & Yorn are two alien races who evolved on the same world as predator and prey respectivly. In their modern society they have evolved a symbiotic relationship with the warlike reptillian 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 a Star Trek Tribble and as such would not be capable of a technilogical society on their own, the Yorn grant them this chance.