Dolphins are marine mammals closely related to whales and porpoise.
The name is originally from Greek,meaning womb.
The animal's name can therefore be interpreted as meaning a fish with a womb.
dolphins are descendants of terrestrial mammals.
There are almost forty species of dolphin and found worldwide.
They are carnivores, eating mostly fish and squid. Dolphins are members of the family Dephinidae which evolved relatively recently, about ten million years ago.