At parties and bars, he introduces himself as a “rat tickler.” The title makes Shimpei Ishiyama sound like he belongs in some forgotten guild of yore, with the Victorian “pure-finders,” who collected ...

If you think laughter and comedy are reserved strictly for humans, you’d be wrong. A study in the late 1990s showed that creatures like rats emit ultrasonic vocalizations while playing with or ...

We’ve known for a decade or so that humans aren’t the only animals who are ticklish. In 2003, researchers learned that rats “giggle” when tickled. They don’t move their mouths or shake their stomachs, ...

Add Yahoo as a preferred source to see more of our stories on Google. It makes us smile every time: We're petting a dog and happen to hit a sweet spot that makes them wriggle with joy. On the flip ...

At parties and bars, he introduces himself as a “rat tickler.” The title makes Shimpei Ishiyama sound like he belongs in some forgotten guild of yore, with the Victorian “pure-finders,” who collected ...