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 ...

New research out of Purdue University shows that the beliefs of laboratory animal personnel are highly associated with their implementation of welfare-enhancing enrichment techniques. This study ...

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 ...