Scientists have discovered a sensory organ in rorqual whales that coordinates its signature lunge-feeding behavior — and may help explain their enormous size. Rorquals are a subgroup of baleen whales — including blue, fin, minke and humpback whales. They are characterized by a special, accordion-like blubber layer that goes from the snout to the navel. The blubber expands up to several times its resting length to allow the whales to engulf large quantities of prey-laden water, which is then expelled through the baleen to filter krill and fish. The study details the discovery of an organ at the tip of the whale’s chin, lodged in the ligamentous tissue that connects their two jaws.