What Are Dolphins?

Dolphins are aquatic mammals related to whales and porpoises.

There are 3 different families of Dolphins in the world. They are:

  • Any member of the family Delphinidae (oceanic dolphins),
  • Any member of the families Delphinidae and Platanistoidea (oceanic and river dolphins),
  • Any member of the suborder Odontoceti (toothed whales; these include the above families and some others),

When we think of Dolphins, we normally think about the Bottlenose Dolphin, which is a member of the family Delphinidae.

There are almost 40 species of dolphin in 17 genera. They vary in size from 1.2 m (4 ft) and 40 kg (88 lb) (Maui's Dolphin), up to 9.5 m (30 ft) and 10 tonnes (the Orca). Most species weigh about 50 to 200 kg (110 to 440 lb). They are found worldwide, mostly in the shallower seas of the continental shelves, and all are carnivores, mostly eating fish and squid.

The family Delphinidae is the largest in the Cetacea. Cetacea is the family consisting of Dolphins, Whales and Porpoises.