A researcher observes finless porpoises on a scientific survey ship in Shanghai, East China, Dec 7, 2017. The scientific survey team of endangered finless porpoises gave a briefing during an open day activity on Dec 7. China launched its first survey of endangered finless porpoises in five years on Nov 10, to monitor their living conditions in moves to better rehabilitate their habitat in the Yangtze River. [Photo/Xinhua]
A researcher observes finless porpoises on a scientific survey ship in Shanghai, East China, Dec 7, 2017.[Photo/Xinhua]
