Lifesavers Rob Howes, his 15-year-old daughter Niccy, Karina Cooper and Helen Slade were swimming 300 feet off Ocean Beach near Whangarei on New Zealand's North Island when the dolphins herded them -- apparently to protect them from a shark.

"They started to herd us up, they pushed all four of us together by doing tight circles around us," Howes told the New Zealand Press Association (NZPA).

Howes tried to drift away from the group, but two of the bigger dolphins herded him back just as he spotted a nine-foot great white shark swimming toward the group.