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The Yangtze finless porpoise is the only freshwater porpoise in the world, and it's facing extinction seeing as only 1,400 individuals are left in the wild. What can we do to help preserve the species and its habitat? Yangtze finless porpoise in a research center in China Porpoises are close relatives of dolphins; they're both fully aquatic toothed whales that use echolocation. Though, this type of whale lacks the dolphin's signature elongated beak and instead has a very sma