The White-fin Dolphin, also known as baiji in Chinese, is a species of freshwater dolphin under first-class protection of wildlife in China. As a homothermal Cetacea, it breathes through its lungs and is called "panda in water". White-fin dolphins are gregarious, which particularly obvious during their mating season in spring. As a carnivorous species, they live in profundal water areas, specifically in the middle and lower reaches of the Yangtze River and its connected areas such as Dongting Lake, Poyang Lake and Qiantang River in China. In 2007, the white-fin dolphin was declared functionally extinct.