Food & Drink2 mins ago
quackers
4 Answers
why doesn't a ducks quack echo
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http://ask.yahoo.com/ask/20021002.html
Either someone has been 'aving a larf with you, or you are doing the same here. This has been a joke for many a year.
http://www.snopes.com/critters/wild/duckecho.htm
seems to explain this much asked question very nicely.