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Humpback Whale Megaptera novaeangliae Length 12-15m Large cetacean that is often active at surface; breaches and engages in flipper- and tail-slapping on water surface. Feeds on shoaling fish and krill. Adult has streamlined, bulky body; broad head covered in lumpy tubercles. Pectoral fins are long and mainly white; dorsal fin is short and stubby. Tail is typically dark above and white with black markings below. Before deep dive, arches back strongly and tail stock and fluke come clear of water before deep dive.