Monday, September 21, 2009
Researchers chanced upon rats playing and noticed what appeared to be laughter. Using a frequency converter, scientists were able to bring the noises to a level audible to human ears. To test if the noise really was laughter, the rats were tickled. Sure enough, the rats generated the same sounds as before when playing amongst themselves.
In addition, the rats began to enjoy the researchers company and follow the hand if it had tickled them.
See the video.