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Owl is widely known for silent flight.Some speciescan smartly suppress the wing-induced aerodynamic noiseto an extremelylowerlevel of frequencies below 2 kHz during gliding or even flapping flight,which is completely undetectable by preys like mouse.Although it has been known that owlsvery likely achieve such low noise owing to their unique wing structures,usually characterized by the serrated leading edge,the fringed trailing edge and the velvety wing surface,theessentialnoise suppressionmechanisms are still unclear.