The Yangtze finless porpoise is an extremely endangered species under the highest level of state protection in China. To save the species from the threat of extinction, an increasing number of conservationists have been making diligent and sometimes risky efforts to protect its habitat. In this edition of Footprints, we follow the trail blazed by the burning passion of Hu Shibin, one such environmental activist, to see how these brave souls are working to protect the Yangtze, one of China's Mother Rivers, and especially its iconic finless porpoise.