China launches survey of endangered porpoises in Yangtze River

Researchers install a sonar on a scientific survey ship in Wuhan, central China's Hubei Province, on Nov. 10, 2017. China on Friday launched its first survey of endangered finless porpoises in five years, to monitor their living conditions in moves to better rehabilitate their habitat in the Yangtze River. (Xinhua/Xiong Qi)