Opinions on River dolphin

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River dolphins are a nontaxonomic category including five living species and one recently extinct species of dolphin that reside in freshwater rivers and estuaries. They inhabit areas of Asia and South America. All members of the group were formerly classified in the cetacean superfamily Platanistoidea, but molecular studies show that river dolphins do not form a clade. Four species live in fresh water rivers, as did the recently extinct fifth species, the baiji or Chinese river dolphin. The sixth species, the La Plata dolphin, lives in saltwater estuaries and near-shore marine environments. However, it is scientifically classed with South American river dolphins rather than in the oceanic dolphin family. Conversely, the tucuxi is classified with marine dolphins even though it is only found within the Amazon Basin.

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