Herdsmen sing and dance at the winter Nadam fair featuring a series of ice and snow events in Hulun Buir, northern China's Inner Mongolia Autonomous Region, Dec. 23, 2015. The three-month festival, which runs through March 1, 2016, will be highlighted with a series of sports including Mongolian wrestling, horse racing, horse taming, skiing and marathon. (Xinhua/Lian Zhen)