A Mongolian herder's children play in tent in Gachuurt, around 40kms east of the capital city of Ulan Bator June 27, 2004. About half of the 2.7 million population in Mongolia are nomads, with tens of millions of heads of cattle, sheep, horses and camels grazing the vast meadows that cover nearly four-fifths of the country, once the centre of one of the world's greatest empires. Picture taken June 27, 2004. REUTERS/Guang Niu GN/PB