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 ...

"When you see a number, it looks like you have an issue," he said. "But in Creswell, those were isolated incidents. They were even isolated to certain floors." The rat pack still runs rampant in ...

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.