Dolphins (scientific name: Delphinidae) are aquatic mammals closely related to whales and porpoises. They live widely in shallow seas near the continental shelf and are occasionally seen in fresh water. Dolphins include more than 60 species in more than 20 genera. Among them, Delphinidae is the largest family of whales and evolved in the Miocene Epoch about 10 million years ago. The length of various dolphins ranges from 1.2 meters to 9.5 meters, and the weight ranges from 40 kilograms to 10 tons. They mainly feed on fish and molluscs. Dolphins are among the most intelligent animals. With their friendly-looking appearance and playful personalities, they have always been very popular in human culture.

Orcinus (killer whale and orca) Orcinus orca (killer whale) Pseudorca (false killer whale) Pseudorca crassidens (false killer whale) ) Delphininae

Genus Delphinus

Long-beaked true dolphin Delphinus capensis

Common dolphin Delphinus delphis

Bottlenose dolphin Genus (bottlenose dolphin) Tursiops (bottlenose dolphin) Indo-Pacific bottlenose dolphin (Indo-Pacific bottlenose dolphin) Tursiops aduncus

Bottlenose dolphin (bottlenose dolphin) Tursiops truncatus Lagenorhynchus white-rumped stripes Dolphin Lagenorhynchus acutus

White-beaked dolphin Lagenorhynchus albirostris

Piedmont dolphin Lagenorhynchus australis

Atlantic dolphin Lagenorhynchus cruciger

Pacific striped dolphin Dolphin Lagenorhynchus obliquidens

Dark-spotted dolphin Lagenorhynchus obscurus Lagenorhynchus white-rumped dolphin Lagenorhynchus acutus

White-beaked dolphin Lagenorhynchus albirostris

Piedger's dolphin Lagenorhynchus australis

Atlantic spotted dolphin Lagenorhynchus cruciger

Pacific spotted dolphin Lagenorhynchus obliquidens

Dark spotted dolphin Lagenorhynchus obscurus Steno (rough-toothed dolphin) rough-toothed Steno bredanensis (rough-toothed dolphin) Lissodelphis (right whale dolphins) Lissodelphis borealis (northern right whale dolphin)

Southern right whale dolphin Lissodelphis peronii (southern right whale dolphin) Stenella attenuata (pantropical spotted dolphin)

Atlantic dolphin Stenella clymene (clymene dolphin)

Stenella coeruleoalba (striped dolphin)

Stenella frontalis (Atlantic spotted dolphin)

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Stenella longirostris (spinner dolphin) Pilot whale subfamily Globicephalinae Pilot whale genus (Pilot whale) Globicephala Big-beaked pilot whale (Big-beaked pilot whale) Globicephala macrorhynchus

Pilot whale ( Pilot whale) Globicephala melas Grampus Grampus griseus (Risso's dolphin) Peponocephala (melon-headed whale) Melon-headed dolphin Peponocephala electra (melon-headed whale) Little killer whale (pygmy killer whale) Feresa attenuata (pygmy killer whale) Feresa attenuata (pygmy killer whale) Orcaella (Irrawaddy dolphin) Orcaella brevirostris Cephalorhynchinae

Irrawaddy dolphin (black and white) Cephalorhynchus

Cephalorhynchus commersonii

Cephalorhynchus eutropia (black dolphin)

Cephalorhynchus heavisidii (Heaviside's dolphin)

Atlantic black and white dolphin Cephalorhynchus hectori (Hector's dolphin)

Dwarf dolphin Sotalia (tucuxi) Amazon white dolphin Sotalia fluviatilis (gray dolphin) Sousa (humpbacked dolphins) Chinese white dolphin Sousa chinensis

Sousa teuszii (Atlantic humpbacked dolphin)