As the mystery of science is understood more and more, we continue to learn not how special humans are, but rather, how we are really the same as all the over creatures of the Earth.

The latest discovery scientists hypothesize is that when rats are tickled, they laugh just like us. Of course you need a special device to hear the ultra-high pitched chirps of laughter, but there’s little mistaking that the rats enjoy the fun as they even chase the hand that tickles them. 

The video was provided to  by Dr. Panksepp, and is covered more on HuffingtonPostScience