Rats seem to emit ultrasonic squeaks of happiness just because they are in the company of another rat. Using newly developed miniature microphones that were placed on rats’ noses, scientists have been ...

SALEM, Ore. (KOIN) — Have you ever actually seen a rat hole? Kellie Nightingale has. She and her Salem neighbors said they see dozens of rats and rat holes up and down a stream bank which runs between ...

Mice and rats vocalize. To us, many of the sounds they make are ultrasonic—at too high a frequency to hear. But if we slow the calls down, they sound like squeaks. And not all squeaks are the same.