Yaks walk on a mountain in the Amne Machin range in China's western Qinghai province, June 7, 2019. Found in the Himalayas, Tibet and Qinghai's high-altitude grasslands, the caterpillar fungus, as cordyceps is also known, has become the most important source of income for local communities, offering seasonal jobs for the poor and a path to riches for commercial harvesters. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.