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 ...

A ticklish rat is an adorable sight to see. The chubby little rodent darts toward a scientist’s gloved hand, eager for the delightful agony of its next scratch. It emits rapid-fire, ultrasonic ...

A viral video of a young gorilla bursting into laughter-like sounds while being gently tickled by a familiar human caretaker ...

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 ...