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Duck's Quacks Do They Echo?
For years it has been assumed by the scientific world that a duck's quack did not echo. Now acoustic engineers near Manchester may have the answer.

Daisy the Duck

Some theories

Daisy the Duck
Daisy the suck was placed in an echo chamber and the results showed positive; the quack did actually echo.

Professer Cox was in charge of the experiment to disprove the popular myth that a duck's quack doesn't echo. The reason for this is still unknown.

Some theories
One most widely regarded theory is the frequecy of the quack. The pitch is so high that the echo is reverberated at en even higer frequency that the human ear finds difficult to intercept.

Another theory is that the quack is echoed in the duck's bill: this would mean that it would not vibrate into the sound that travels through air.