Francis Galton was busy fashioning brass tubing into an ultrasonic whistle. This unique sliding whistle would produce high-pitched sounds at frequencies above the limit of human hearing. Galton tested ...

The silent whistles had another benefit: Ultrasonic sound that can travel farther. That became useful when a dog was far away from its owner but communication was still necessary. And whether a ...

The silent dog whistle was developed to train dogs in areas where noise disturbances weren’t welcome, such as neighborhoods. One advantage of the silent whistle is ultrasonic sound can travel greater ...

Ultrasonic sounds are high-frequency sound ... This heightened sensitivity enables them to detect sounds like dog whistles and the subtle noises made by rodents, making them excellent hunters ...