How many kinds of dolphins exist?
How many kinds of dolphins exist? Currently there are 49 dolphin and porpoise species which are grouped into six families: the oceanic dolphin family is by far the largest with 38 members; the porpoise family has seven members; and there are four river dolphin families, each containing just one species. What is the rarest type of dolphin? Hector's Facts. Hector's dolphins are the smallest and rarest marine dolphins in the world. They have distinct black facial markings, short stocky bodies and a dorsal fin shaped like a Mickey Mouse ear. What are the 5 most common dolphins? How Many Dolphin...