Tummy-tickling causes rats to break out in giggles and jump with joy - but only when they are happy, a study has shown. Scientists confirmed the ticklishness of rats in experiments that involved ...

A new study is linking brain behavior to silly playtime practices. And they have lab rats laughing out loud to prove it.In the video above, you can hear tiny high-pitched giggles from a rat being ...

As you gently rub your dog's tummy, the look of glee on his face and all four legs in the air suggests he's loving the attention. But why? Why do dogs love belly rubs? If you've ever pondered on this ...