Dolphins belong to the order Odontoceti. This classification is called Delphinidae and this family contains many of the better known dolphins, including 'the common dolphin', and the 'bottle nosed dolphin'.
The Odontoceti is made up of 10 families, each dolphin  is described for you....A lot of species! Each family has different species.

To learn about all those species, just enter here and choose your species in the top frame!
Enjoy!