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Our fin tips are a case of biomimetics : the outline is derived from the facing beaks of the dodo  ( Raphus cucullatus ) and the functional purpose is informed by the bottlenose dolphin  ( Tursiops truncatus ) fluke to improve thrust efficiency. Representation of two upper dodo beaks facing each other which inspired the tip outline Our twin-lobed fin tip is designed to shed coherent vortex rings and a focused momentum jet. Behaviors observed in live dolphins with flow visuali