A staff member feeds finless porpoises of the Yangtze River at the Institute of Hydrobiology under Chinese Academy of Sciences in Wuhan, central China's Hubei Province, June 8, 2018. The second artificial-bred Yangtze finless porpoise, which was born on June 2, 2018, appears to be in good health. Among the most endangered animals native to the Yangtze, finless porpoise is under the first class national protection in China. (Xinhua/Jin Liwang) 

A baby finless porpoise of the Yangtze River is seen swimming with its mother in a pool at the Institute of Hydrobiology under Chinese Academy of Sciences in Wuhan, central China's Hubei Province, June 2, 2018. The second artificial-bred Yangtze finless porpoise, which was born on June 2, 2018, appears to be in good health. Among the most endangered animals native to the Yangtze, finless porpoise is under the first class national protection in China. (Xinhua/Jin Liwang) 

A baby finless porpoise of the Yangtze River is seen swimming with its mother in a pool at the Institute of Hydrobiology under Chinese Academy of Sciences in Wuhan, central China's Hubei Province, June 2, 2018. The second artificial-bred Yangtze finless porpoise, which was born on June 2, 2018, appears to be in good health. Among the most endangered animals native to the Yangtze, finless porpoise is under the first class national protection in China. (Xinhua/Jin Liwang) 

A staff member feeds a finless porpoise of the Yangtze River at the Institute of Hydrobiology under Chinese Academy of Sciences in Wuhan, central China's Hubei Province, June 8, 2018. The second artificial-bred Yangtze finless porpoise, which was born on June 2, 2018, appears to be in good health. Among the most endangered animals native to the Yangtze, finless porpoise is under the first class national protection in China. (Xinhua/Jin Liwang) 

A staff member feeds a finless porpoise of the Yangtze River at Tian'ezhou National Nature Reserve of Yangtze River Porpoise in Shishou, central China's Hubei Province, Sept. 11, 2018. The second artificial-bred Yangtze finless porpoise, which was born on June 2, 2018, appears to be in good health. Among the most endangered animals native to the Yangtze, finless porpoise is under the first class national protection in China. (Xinhua/Jin Liwang) 

A finless porpoise of the Yangtze River is seen swimming in a pool at the Institute of Hydrobiology under Chinese Academy of Sciences in Wuhan, central China's Hubei Province, June 8, 2018. The second artificial-bred Yangtze finless porpoise, which was born on June 2, 2018, appears to be in good health. Among the most endangered animals native to the Yangtze, finless porpoise is under the first class national protection in China. (Xinhua/Jin Liwang)