Mark Carwardine / Humpback whale, pectoral fin slapping water {Megaptera novaengliae} Ecuador, Machalilla

Mark Carwardine / Humpback whale, pectoral fin slapping water {Megaptera novaengliae} USA Atlantic coast

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) pectoral fin slapping, watched by Graeme Ellis and family, off of Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) female courted by cooperating causesd bubbles by slapping surface with pectoral fin, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS...

Steven David Miller / Humpback Whale (Megaptera novaeangliae) slapping its pectoral fin. Hervey Bay, Queensland, Australia

Steven David Miller / Humpback Whale (Megaptera novaeangliae) slapping its pectoral fin. Hervey Bay, Queensland, Australia

Suzi Eszterhas / Humpback Whale (Megaptera novaeangliae) pectoral fin slapping, Sea of Cortez, Baja California, Mexico

Juergen Freund / Pectoral fin of Humpback whale (Megaptera novaeangliae) slapping, off coast of Tonga

TOM WALMSLEY / Humpback whale slapping water with long flipper {Megaptera novaeangliae} Iceland