How many dolphins are in the world?

There are at least 40 species of dolphin and porpoise (there is some argument about whether some species are subspecies of another), and very little is known about most of these. read more

Dolphins are a widely varying species and can be found in many different habitats from seas to oceans and even rivers. For example, the Indus dolphin, which is a blind dolphin species that inhabits rivers in India, has only 600 members and is considered endangered. read more

According to some sources, there are 42 species of dolphins which belong to the family delphinade of oceanic dolphins. read more