Turns Out They Really Are Named Flipper

Scientists, who clearly have nothing better to do, have determined that dolphins call each other by name:

DOLPHINS may be closer to humans than previously realised, with new research showing they communicate by whistling out their own “names”.

The evidence suggests dolphins share the human ability to recognise themselves and other members of the same species as individuals with separate identities. The research, on wild bottlenose dolphins, will lead to a reassessment of their intelligence and social complexity, raising moral questions over how they should be treated.

And why do they whistle each other's names?

Just for the halibut.