But why would they be doing this?
The Dodo reached out to several dolphin experts to weigh in on the purpose of this bizarre behavior, but none could say for certain.
Rick O'Barry, Campaign Director of the Dolphin Project, offered perhaps the simplest and most satisfying explanation: pure amusement.
I think they are simply having fun. I have seen this before. They could also be catching the wind with their tail fluke. You might notice that most of the flukes are facing the same direction - the direction of the oncoming wind