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 tickled in the name of science.

Rats have what appears to be a “laugh centre” in their midbrain that is activated when the animals are tickled or when they engage in play behaviours. Researchers first discovered that rats ...

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 tickled in the name of science.

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 tickled in the name of science.