2015: Best Humpback Whale Photos - maui-mike
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While performing a flukes-slash (violently whipping it tail from side-to-side, rather than up and down as in a flukes-slap), this whale displays the scalloped trailing-edge of one of its flukes. Research indicates that this fringe-like structure, visible on the trailing edges of both the flukes and the pectoral fins, makes those appendages more hydro-dynamically efficient.
10 January 2015 -- Ma’alaea Bay, Maui

Megaptera novaeangliaemegapteraHumpback whalesHumpback whalebaleen whalesrorqualcetaceanswhaleswhaleHawaii's whalesMaui's whalesnorth Pacific populationBalaenopteridae