Until recently it was thought that the "quack" of ducks did not generate an echo . But a couple of years ago, Professor Trevor Cox, from the University of Salford Acoustic Research Center (UK), managed to smash this urban legend by recording the squawk of a leg called Daisy in a reverberation chamber.
In this way he demonstrated that the sound waves that originate the animal's cry are also reflected when they hit a hard surface, giving rise to the acoustic phenomenon that we call echo. What is certain is that the echo of the squawking of these birds is hardly perceptible by the human ear, especially in open spaces. In addition to that, according to Cox, the long "aaaacckkk" at the end of the duck's call manages to mask any echoes.
