Mark Jones / Bottlenose Dolphin (Tursiops truncatus) underwater group, Roca Redonda, Galapagos Islands, Ecuador

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) underwater pair, Hawaii

Hiroya Minakuchi / Bottlenose Dolphin (Tursiops truncatus) female underside showing urogenital, anal and mammary slits with ventral fin, caught along the coast of Japan, courtesy of Taiji Whale Museum

Hiroya Minakuchi / Bottlenose Dolphin (Tursiops truncatus) silhouette in pool, caught along the coast of Japan, courtesy of Taiji Whale Museum