Rats emit a high-pitched squeak when around another rat, seemingly just to express a positive emotion By Christa Lesté-Lasserre 7 November 2023 ...

Some rats are more ticklish than others – and you can tell by how much they squeak with ‘laughter’ Rat call patterns could be used to measure their emotional response to actions; ...

During social interactions, rats make ultrasonic vocalizations, imperceptible to the human ear, which reflect their emotions. For example, when happy, they tend to emit squeaks at about 50 kHz.

In an astonishing blend of robotics and nature, SMEO—a robot rat designed by researchers in China and Germany — is fooling real rats into treating it like one of their own. What sets SMEO apa… ...

BOISE, Idaho — Unwanted guests are squeaking through the Treasure Valley – rats. They’ve been around since at least 2020, but residents are now saying they are becoming even more apparent.