Photos show scientists breeding rare and endangered animals in China’s longest river

A dozen sleek grey Yangtze finless porpoises glide inside a vast pool at the Institute of Hydrobiology in Wuhan as scientists find ways to protect and breed the rare mammals in China’s longest river. The Yangtze River is one of the busiest inland waterways in the world with 16 major ports. Cargo shipping volume along the river topped 4 billion metric tons (4.4 billion U.S. tons) in 2024, according to state media. The finless porpoise has become a barometer of the river’s health. The population of the critically endangered species plunged from over 2,500 in the 1990s to just 1,012 in 2017 due to pollution, boat traffic and illegal fishing that depleted food supplies, researchers said. The change alarmed the scientific community, including veteran researcher Wang Ding. He led an international team on a 2006 search for Baiji dolphins, another species that was nearing extinction. Despite a nine-day search, not a single dolphin was found and the Baiji was declared functionally extinct....