Dian Lake
More than 160 amphibian species are known from the Yangtze basin, including the world's largest, the critically endangered Chinese giant salamander. It has declined drastically due to hunting (it is considered a delicacy), habitat loss and pollution. The polluted Dian Lake, which is part of the upper Yangtze watershed (via Pudu River), is home to several highly threatened fish, but was also home to the Yunnan lake newt. This newt has not been seen since 1979 and is considered extinct. In contrast, the Chinese fire belly newt from the lower Yangtze basin is one of the few Chinese salamander species to remain common and it is considered least concern by the IUCN.