Laughter is primarily a social tool unique to humans, reflecting the complexity of human social communication compared to other animals. Research indicates that laughter among various primates, such as gorillas and orangutans, suggests a common evolutionary origin, with laughter evolving differently across species. The phenomenon of ticklishness, which is predominantly found in primates, raises questions about whether laughter evolved from this response. Some animals, like ferrets, exhibit behaviors akin to laughter through playful sounds, indicating that elements of laughter may exist in other species. Recent studies have recorded and analyzed the sounds made by different primates when tickled, revealing that closely related species produce similar laughter sounds, further supporting the evolutionary connections among them.
… was that Grad student - yes, or Grad student - no ? 
