english: Chimpanzees laugh differently if they're being tickled than if they're playing with each other, and we might be seeing something like that here, involuntary laughter, tickling laughter, being different from social laughter.
non_english: Šimpanze se smeju drugačije ako ih golicate nego kada se međusobno igraju, a može biti da vidimo  nešto slično tome ovde - nevoljni smeh, smeh zbog golicanja, drugačiji od društvenog smeha. Akustično su veoma različiti.