I believe this site answers it all very thoroughly:
Someone actually went into the trouble of put ting a duck on an anechoic chamber to answer this great mystery of nature. :-)
Blog That A-Ha Moment Larry Desjardin 10 comments Have you ever had an a-ha moment? Sure, you have. The Merriam-Webster dictionary defines it as "a moment of sudden realization, inspiration, insight, recognition, or ...