Called the baiji Baiji, the oceanic whitetip is a freshwater cetacean Lipotidae animals, only produced in the middle lower reaches of the Yangtze River, with kiss, the body is spindle shaped, whole body naked skin glabrous, gregarious, gentle care, audio-visual organ serious degradation, sonar system is especially sensitive. It is a warm blooded animal, lungs, known as the "water of the giant panda". To the 20th century, due to various reasons make the population decreased, estimated in 2002 has been less than 50 head dolphin is not only listed as wild animal protection at the national level, and is one of the world's 12 most endangered animals. In August 8, 2007, "the Royal Society" in the journal Biological letterhead issued a report, officially announced the baiji functional extinction.
白鳍豚也称为
白暨豚、白鳍，是一种淡水鲸类白鱀豚科动物，仅产于中国长江中下流域，具长吻，身体呈纺锤形，全身皮肤裸露无毛，喜欢群居，性情温顺谨慎，视听器官严重退化，声纳系统特别灵敏。白鳍豚是
恒温动物，用肺呼吸，被誉为“水中的大熊猫”。至20世纪由于种种原因使其种群数量减少，2002年估计已不足50头，白鳍豚不仅被列为国家一级野生
保护动物，也是世界12种最
濒危动物之一。2007年8月8日，《皇家协会生物信笺》期刊内发表报告，正式公布白鳍豚
功能性灭绝。