I think maybe there are a couple of different species here.... The main one I think is Globicephala macrorhynchus, but the other fins look a little different. Not sure...
large pod hassling the orcas
None in group were larger than 3m - group consisted of 8 - 10 individuals. These are additional photos to assist identification.
Dolphin citing at Copacabana beach
Field Notes - We were sailing off manly when we saw a group of boats who were watching two whales who were blowing and breathing a lot as well as flicking their tail out of the water together. Sometimes there were periods of time up to 10 minutes without coming to the surface. They were really beautiful and it was a pleasure to see them.