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 ...

Add Yahoo as a preferred source to see more of our stories on Google. A rat king displayed at the University of Tartu Natural History Museum in Estonia. Some have claimed that the phenomenon in which ...

Now that we know octopi like to play with cameras, it’s time to investigate other forms of animal play. Did you know that rats laugh when you tickle them? This ...

One study found that rats emitted ultrasonic vocalizations when they were subjected to manual somatosensory stimulation, i.e., tickling. The results of this controversial research were published in ...