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A newly born Yangtze finless porpoise (center) swims
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A newly born Yangtze finless porpoise (center) swims with its mother (left) and sibling at the Hydrobiology Institute of the Chinese Academy of Sciences in Wuhan of Hubei Province, China. The Yangtze finless porpoise is the only porpoise in the world that lives in freshwater and is classified as endangered.(Credit: Getty Images / China Photos)

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Animals near extinction

Elizabeth Kolbert's revelatory new book, "The Sixth Extinction: An Unnatural History," tells how human behavior is making the world unlivable for other species. Take a look at some of the world's most endangered animals.