Atlantic White-sided Dolphin
Lagenorhynchus acutus

f5.6 @ 1/1000s, ISO:500, Nikon D300S w 300mm and 1.4X tele-converter

"Atlantic White-sided Dolphin," Wikipedia, the free encyclopedia. The Atlantic White-sided Dolphin (Lagenorhynchus acutus) is a distinctively colored dolphin found in the cool to temperate waters of the North Atlantic Ocean.The key distinguishing feature is the white to pale yellow patch found behind the dorsal fin of the dolphin on each side. This variation in color to the Atlantic White-sided Dolphin is unique amongst the mixtures of white, greys and blues of other pelagic cetaceans. The rest of the body's coloration is well demarcated: the chin, throat and belly are white; the flippers, dorsal fin and back are dark grey to black with the exception of the yellow patch; there is a further white patch below the dorsal fin, lying above a light grey stripe that runs from the beak, above the eye and down to the tail stock.
Stellwagen Bank, Massachusetts