Amazon river dolphin
Life expectancy of the Amazon river dolphin in the wild is unknown, but in captivity, the longevity of healthy individuals has been recorded at between 10 and 30 years. However, the average longevity in captive animals is only 33 months. An individual named Baby at the Duisburg Zoo, Germany, lived at least 46 years, spending 45 years, 9 months at the zoo.