There are approximately 39 species of oceanic dolphins that belong to the family Delphinidae and five species of river dolphins which dwell in freshwater.
Chinese River Dolphin Project. This video includes Chinese River Dolphin pictures with an informative audio in the background.
There are only four species of dolphins that are able to thrive in freshwater and the Amazon River Dolphin is one of them. Many people assume that all dolphins live in saltwater so this is interesting to learn if you weren’t aware of it.