A rat can appear completely silent while making a sound that falls far beyond the range of human hearing. Around 50 kilohertz, these ultrasonic vocalisations are produced during play, social ...

A team of neurobiologists at the University of Haifa's, Sagol Department of Neurobiology has found, via the use of novel miniature microphones, that rats make sounds when in the company of other rats ...

"It's as if there's a bird dawn chorus happening all night, but we would never know because we can't hear it." ...