It is subspecies of the South Asian river dolphin. The dam contributed to the functional extinction of the baiji Yangtze river dolphin. The Amazon river dolphin is the largest river dolphin. The eye and optic nerve of the Ganges river dolphin are degenerate. Type I has been found in the Amazon river dolphin and harbour porpoises. During the 1970s, China recognized the precarious state of the river dolphin. As China developed economically, pressure on the baiji river dolphin grew significantly. As China developed economically, pressure on the Chinese river dolphin grew significantly. The Ganges river dolphin also face an imminent threat. As China developed economically, pressure on the river dolphin grew significantly. Therefore, the Bolivian river dolphin is currently recognized as a subspecies. The diet of the Amazon river dolphin is the most diverse of the toothed whales. The Amazon river dolphin has historically been kept in dolphinariums. The Indus river dolphin formerly also occurred in the tributaries of the Indus river. The Indus river dolphin has been named as the National Mammal of Pakistan.