There are 36 different species of dolphins throughout the world. Thirty-two of these species are oceanic dolphins that live in saltwater, while four are river dolphins that live in freshwater.
A family called the Platanistidae family contains most of the species of river dolphins. These species include the Ganges River Dolphins, the Indus River Dolphins, Amazon River Dolphins, Chinese River Dolphins and Franciscana River Dolphins. These dolphins live in different rivers all over the world, as their names suggest.
Another family of dolphins is the Stenidae family, which includes Rough-Toothed Dolphins, Pantropical Spotted Dolphins, Spotted Dolphins, Atlantic Spotted Dolphins, Striped Dolphins, Long-Snouted Spinner Dolphins, Short-Snouted Spinner Dolphins, Tucuxi Dolphins, Guiana River Dolphins, Chinese White Dolphins, Borneo White Dolphins, Speckled Dolphins, Plumbeous Dolphins, Cameroon Dolphins and Rio De Janeiro Dolphins.
A final family of dolphins, the Delphindae family, includes the Bottlenose Dolphin, the most friendly and well-known species of dolphin. Other members of this family include: Common Dolphins, Risso's Dolphins, White-Sided Dolphins, White Beaked Dolphins, Dusky Dolphins, Falkland Island Dolphins, Hour Glass Dolphins, Peale's Dolphins, Sarawak Dolphins,Pygmy Killer Whales, Heaviside’s Dolphins, White Bellied Dolphins, Orcas, Irrawaddy River Dolphins, Pilot Whales, False Killer Whales, Short-finned Pilot Whales, Broad Beaked Dolphins, Southern Right Whale Dolphins and Northern Right Whale Dolphins.