Common Dolphins (Delphinus capensis): two up and two down.
Image 1 of 4 in a series:   A large ball of krill (Thysanoessa spinifera) starts to bulge upward and thousands of individual krill actually leap out of the water to escape the lunging Humpback Whale (Megaptera novaengliae) just below.
Common Dolphins (Delphinus capensis): two up and two down.
Common Dolphins (Delphinus capensis): two up and two down.
Common Dolphins (Delphinus capensis): two up and two down.
See photo in original gallery.