whistler

:  one that whistles: such asa :  any of various birds; especially :  any of numerous oscine birds (especially genus Pachycephala) found chiefly in Australia and South Pacific islands and having a whistling callb :  a large marmot (Marmota caligata) of northwestern North America having a shrill alarm callc :  a broken-winded horsed :  a very-low-frequency radio signal that is generated by lightning discharge, travels along the earth's magnetic-field lines, and produces a sound resembling a whistle of descending pitch in radio receivers