Which whale has the longest pectoral fins relative to body size?

The humpback whale has the longest pectoral fins relative to its body size. Its exceptionally long flippers can reach roughly one-third of its body length, making them the most distinctive proportion among the great whales.

Those fins are not just oversized ornaments. Humpback whales use them for steering, braking, rolling and precise maneuvering while feeding. Their leading edges contain rounded tubercles, which help control water flow and may improve lift—an unusual design that has inspired aerodynamic research.

The name Megaptera novaeangliae means “big-winged New Englander,” a reference to the species’ enormous flippers and its early scientific description. Humpbacks are also famous for complex songs, bubble-net feeding and spectacular breaches. Adults commonly measure around 12–16 metres, while the largest females can approach 18 metres.

A common mix-up is confusing long pectoral fins with the largest overall flippers. The blue whale is much bigger, but its flippers are proportionally shorter. Humpback whales’ long “wings” are the feature that gives this species its answer.