In December, 2006, the Chinese river dolphin, also know as the baiji (which means “the goddess of the Yangtze”), became extinct. According to http://www.washingtonpost.com/ , they became extinct because of pollution and ship trading. Pollution was a major effect because the baiji’s habitat was being filled with sewage and the propellers disrupted the dolphin’s sonar-based sensory system. Human activity is affecting many animal habitats with as a result animals who lived on this earth longer than us are becoming extinct. If we stop the pollution we can save the worlds most beautiful creatures.
There are no subspecies of the Yangtze River Dolphin.