An archaeologist and a worker of Mexico's National Institute of Anthropology and History (INAH) work at a site where more than 100 mammoth skeletons have been identified, along with a mix of other ice age mammals, at an area where a new international airport is currently being built, in Zumpango, near Mexico City, Mexico September 8, 2020. Picture taken September 8, 2020. REUTERS/Henry Romero