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 ...

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 ...