Certain species of dolphins use echolocation to find their prey: they emit ticking sounds and then receive echoes reflected by distant objects in the water  Marine biologists speculate that these ticking sounds may have another effect: the dolphins use unusually high-frequency ticking
As a signal for the discovery of prey, the ticking sound of the dolphin is not perceivable by the senses of its prey. Only the dolphin can perceive and locate it
 The sound overloads the prey's senses, which stuns prey at close range