GANGCHA COUNTY, CHINA - NOVEMBER 8: (CHINA OUT)  A Whooper Swan flies over the Qinghai Lake on November 8, 2005 in Gangcha County of Qinghai Province, China. Over 3,000 Whooper Swans from northern Russia, Siberia and Xinjiang Autonomous Region in northwestern China have flown to Qinghai Lake to spend the winter. Local authorities took precautionary measures against bird flu outbreak caused by migratory birds. According to state media, stepping up in its fight against bird flu, China has terminated 6 million birds due to the latest outbreak of the virus, and ordered the immediate closure of all live poultry and pet bird markets in Beijing. (Photo by China Photos/Getty Images)