In "Dolphins Up Close with Bertie Gregory," the National Geographic explorer looks to the camera and says, "Any day you see a dolphin is a good day." And that was Gregory's main objective for his ...

With the feeding frenzy in full swing, the dark blue sea water is a flurry of movement. Dozens of dolphins dart up from below while seabirds dive underwater, all trying to snatch a snack from a large, ...