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 ...

In the summer of 1876, in a workshop on the outskirts of London, Francis Galton was busy fashioning brass tubing into an ultrasonic whistle ... Today, many hunters and dog trainers swear by modern ...

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 ...