Rare porpoise in danger of extinction

(FILES) Photo taken on November 9, 2006 shows a keeper playing with an endangered finless porpoise in Wuhan Baji Aquarium in China's central Hubei province. Chinese scientists on November 11, 2012 begin a month long survey of the dwindling population of the endangered finless porpoise known as the "river pig" by locals, in the Yangtze River, China's longest waterway at more than 6,000 kilometres (3,700 miles) as the animal edges towards extinction from man-made threats. AFP PHOTO/Peter PARKS.PETER PARKS/AFP/Getty Images
(FILES) Photo taken on November 9, 2006 shows a keeper playing with an endangered finless porpoise in Wuhan Baji Aquarium in China's central Hubei province. Chinese scientists on November 11, 2012 begin a month long survey of the dwindling population of the endangered finless porpoise known as the "river pig" by locals, in the Yangtze River, China's longest waterway at more than 6,000 kilometres (3,700 miles) as the animal edges towards extinction from man-made threats. AFP PHOTO/Peter PARKS.PETER PARKS/AFP/Getty Images

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    Rare porpoise in danger of extinction

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CNN's David McKenzie meets a critically endangered species in China and the scientists trying to save it.