A pod of dolphins were being praised for providing a protective barrier around a group of swimmers who were being threatened by a great white shark off the northeastern coast of New Zealand. Rob Howes and three other lifeguards were on a training swim about 100 metres off shore at Ocean Beach near here when the dolphins raced in and herded the group together. "They started to herd us up, they pushed all four of us together by doing tight circles around us," Howe said Tuesday. When he tried to drift away from the group, two of the bigger dolphins...