Dolphins "know each other's names"

I'm sure a few people reading this won't exactly be surprised, but having supporting research for this might be quite groundbreaking. 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. Dolphins, like humans, recognize names UPDATE: New link with more information