A pod of dolphins kept a group of swimmers safe off the coast of New Zealand about three weeks ago. The people involved had originally decided to keep the story to themselves until they could confirm what they had seen, but have now come out with the details.
A Lifeguard training session was taking place about 100 metres offshore when a pod of dolphins began herding them into a tight circle. When some of the swimmers tried to move away they were herded right back. They had no idea why the dolphins were exhibiting such unusual behaviour, until a three metre great white shark swam by!
"Auckland University marine mammal research scientist Doctor Rochelle Constantine said dolphins were normally vigilant in the presence of sharks. The altruistic response of the dolphins was normal, she said. 'They like to help the helpless.'"
Full article here (Animal Tales)