The distinctive hair style of this Dassanech man, achieved using a combination of clay, animal fat and ochre, signifies that he has killed a man recently. In time he will make patterns of scars on his chest and shoulders as a lasting mark of his prowess in combat. Much the largest of the tribes in the Omo Valley numbering around 50,000, the Dassanech (also known as the Galeb, Changila or Merille) are Nilotic pastoralists and agriculturalists.