RUKUM, June 3, 2016 (Xinhua) -- People carrying firewood are on their way to the Pupal valley of Rukum district to participate in the yarsagumba harvesting, Nepal, May 28, 2016. Thousands of people gathered at the Pupal valley, some 4500 meters above the sea level, from May to June to pick up yarsagumba, or caterpillar fungus, which is highly valued in the global market. (Xinhua/Pratap Thapa)