river dolphin

river dolphin

noun
any of several long-snouted usually freshwater dolphins of South America and southern Asia 
WordNet® 3.0, © 2006 by Princeton University.
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Encyclopedia Britannica
Encyclopedia

river dolphin

any of four or five species of small, usually freshwater aquatic mammals that are related to whales (order Cetacea). These dolphins are found in rivers of south-central Asia, China, and South America and in the coastal waters of Brazil, Argentina, and Uruguay. River dolphins have long beaks and rounded foreheads, distinguishing them from more familiar-looking dolphins such as the bottle-nosed dolphin of the family Delphinidae.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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