A tribe swap on day 6 sent David & Elton to Moso and Imogen & Nicolle to Kakula, and the tribes merged into the Tanna tribe on day 12.
A tribe exchange on day 6 moved David & Elton to Moso and Imogen & Nicolle to Kakula, leading to the eventual merging of the two tribes into the Tanna tribe on day 12.