Migrant birds swim on the Xingkai Lake, border lake between China and Russia, in northeast China's Heilongjiang Province, March 28, 2017. (Xinhua/Wang Jianwei)
Migrant birds swim on the Xingkai Lake, border lake between China and Russia, in northeast China's Heilongjiang Province, March 28, 2017. (Xinhua/Wang Jianwei)