The five different river dolphins are the Chinese river dolphin, the ganges river dolphin, the indus river dolphin, the franciscana (la plata) dolphin ( the only known living species of salt-water river dolphin), and the amazon river dolphin.
The other colors for river dolphins include white, yellow, gray, and brown!
The world conservation union, also known as the international union for the conservation of nature and natural resources (IUCN) is an international organization based in Gland, Switzerland, devoted to the conservation of natural resources
It was founded in 1948 and groups 83 states, 108 governmental agencies and more than 10,000 scientist and experts from all around the world!
The IUCN publishes an red list of endangered species. River dolphins are among that list!