Oo oo, ha ha: why humans and great apes giggle alike when tickled

If you tickle a chimpanzee, a gorilla, and a six-month-old baby, something unexpected happens: they all laugh at the same pace, with regular intervals between one laugh and the next. It's not just a similar sound — it's the cadence itself that's identical, almost as if they were following an ancient score. We all think that laughter is one of the most human things there is — a sign of social intelligence or emotional complexity. But this discovery turns the perspective upside down: the "pattern" of our laughter comes from much further back, perhaps from an ancestor that lived 15 million years ago. And it means that the ability to control our sounds in a sophisticated way is not just ours, but something we share with the great apes. Chiara De Gregorio, a primatologist at the University of Warwick, recorded 140 sequences of laughter: 42 from bonobos, 35 from chimpanzees, 34 from gorillas, 16 from orangutans, and 13 from human children playing with their mothers. The result? When they were tickled, they all maintained the same regular rhythm between one "ha" and the next. Simon Townsend, who studies primate communication in Zurich, says this data confirms that our "close relatives" have much more control over their sounds than we thought. But there is one crucial detail: when the context changes, the laughter also changes. During free play, both among animals and among children, laughter becomes irregular, almost chaotic. De Gregorio describes it as follows: “If you think of two animals playing, or two children rolling around, anything can happen. Physical movements change breathing and break the rhythm." In practice, regular laughter emerges when there is a clear external stimulus — such as tickling — while in free play the body takes over and the voice loses its metronome. Now try to think about it: the way we laugh is not just culture or character, but a reflection of an evolutionary history that runs through us, which we instinctively connect to those who came before us millions of years ago. And, for once, science tells us that laughing with a chimpanzee is not a bar joke, but a biological truth. There is an angle that no one considers: if regular laughter emerges from an external stimulus and chaotic laughter from free play, then perhaps the true human uniqueness is not in laughter itself, but in how we use it to create bonds even outside of those stimuli. Perhaps social laughter, the kind that comes from a joke, a memory, or a shared moment, is the real evolutionary leap that sets us apart. But the root, that regular beat between one "ha" and the next, still connects us to the forests of millions of years ago. Laughter is not just ours: it is an ancient echo that unites us with the great primates. If this story has changed the way you think about laughter, you can press I'm In on Lara Notes — it's not a like, it's your way of saying: this idea is now yours. And if you feel like telling someone about this, on Lara Notes you can tag them with Shared Offline — because certain discoveries deserve to be remembered even outside the screen. This note comes from Nature and saves you 7 minutes.