It’s well known that many animals are particularly sensitive to high-frequency sounds that humans can’t hear. Many commercial pest repellers based on this principle are available, most of them ...

"My son, Billy, picked up this silent dog whistle at a pet supply store." My friend George held out his hand to show me a small shiny metal whistle and then he continued, "Billy said that he was told ...

Mice court one another with ultrasonic love songs that are inaudible to the human ear. New research shows they make these unique high frequency sounds using a mechanism that has only previously been ...