This seems like a contender for an IgNobel prize. I had never heard this, "There is an old wives' tale that a duck's quack has no echo." Apparently, because of The best duck experiment ever conducted by physicists this isn't true.
"Researchers at Salford University's Acoustics Research Center brought a duck into both a reverberation chamber, which emphasizes echoes, and an anechoic chamber, which so masks any sound that it has been said to make people inside of it ill. They recorded the duck's quacks and found soon enough that it echoes just like any other sound."
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