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.

(CNN)-- Rats can be taught to play hide and seek -- and they squeal with joy when they win, scientists have found. Both wild and domesticated animals have been known to play, but neuroscientists from ...

The next time you come across a rat darting furtively for cover, consider this: It might just want to have a playful game of hide-and-seek. A group of neuroscientists in Germany spent several weeks ...