WUHAN, May 10, 2016 (Xinhua) -- A 7-year-old pregnant finless porpoise named as "F9" swims in the Institute of Hydrobiology under Chinese Academy of Sciences, in Wuhan, central China's Hubei Province, May 10, 2016. The current finless porpoise population, according to scientists, is less than 1,000. As one of the most endangered animals, the finless porpoise is mainly to be found in the middle and lower reaches of Yangtze River and the connecting Poyang and Dongting lakes. (Xinhua/Cheng Min)