This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Rats can be taught to play hide and seek — ...

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 ...

(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 ...