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 ...

A national watchdog group has filed an administrative complaint with Penn State’s president after an unpublished report from ...

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 ...