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The Yangtze Dolphin is the first aquatic mammal species to become extinct since the demise of the Japanese Sea Lion and the Caribbean Monk Seal in the 1950s.
■ Fossil records suggest that the dolphin first appeared 25 million years ago and migrated from the Pacific Ocean to the Yangtze River 20 million years ago.
■ In the 1950s, the population was estimated at 6,000 animals,[11] but declined rapidly over the subsequent five decades. Now the most endangered cetacean in the world, according to the Guinness Book of World Records,[3] the Baiji was last sighted in September 2004.
■ In the 1950s, the population was estimated at 6,000 animals,[11] but declined rapidly over the subsequent five decades. Now the most endangered cetacean in the world, according to the Guinness Book of World Records,[3] the Baiji was last sighted in September 2004.
