Rosa Rubicondior: Creationism Refuted - Common Origin Of Human And Other Ape Laughter.

Apes & humans have been sharing a laugh for 15 million years

A stunning example of how science incidentally refutes creationism has just been published in Communications Biology by researchers at the University of Warwick, UK. This is not merely another example of biologists continuing, despite creationist predictions, not to abandon “Darwinism” in favour of creationist magical thinking — the event that creationists have been confidently expecting any day now for more than half a century. It is also a discovery for which evolution provides the obvious and coherent explanation.

Nor is this one easily dismissed by creationists as the result of “The Fall”, Satanic interference, or any of the other routine excuses used when nature refuses to look intelligently designed. Resorting to “common design” merely makes their putative designer god look as though it deliberately created evidence, which is exactly what the Theory of Evolution predicts, apparently in order to mislead us. As Francis Collins pointed out in The Language of God, this image of God as a cosmic trickster is the ultimate admission of defeat for creationists, and shows Young Earth Creationism to be both theologically and scientifically bankrupt.

The shocking thing is how few Christians ever take their co-religionists to task on social media for being prepared to portray their god in this way, rather than having the moral and intellectual integrity to admit that they are wrong. Even their own god is sacrificed on the altar of their implacable vanity.

So, what is this finding by the University of Warwick group?

Quite simply, it is evidence that humans, chimpanzees, bonobos, gorillas and orangutans share a similar rhythmic pattern in laughter, suggesting that this feature was already present in the last common ancestor of all living great apes, including humans, about 15 million years ago. The finding also offers clues to the evolution of human speech.

The researchers analysed laughter recordings from four orangutans, two gorillas, three bonobos, four chimpanzees and four human children. Across 140 laughter bouts, they found the same basic pattern: all species produced laughter with evenly spaced rhythmic intervals between successive sounds. In other words, great ape laughter is not random noise, but has a conserved rhythmic structure.

However, while this basic rhythm has remained remarkably conserved, human laughter has become faster, more variable and more sensitive to social context. Humans are the only great apes in the study shown to vary the timing of laughter according to context — for example, the difference between involuntary laughter when tickled, polite laughter in a social setting, nervous laughter after a mistake, or infectious laughter in a group. This suggests that the increasing ability to control the timing and rhythm of vocalisations may have contributed to the evolution of speech.

A useful way to frame this is that no single feature “proves” common ancestry on its own. The strength of the evidence lies in the way many independent features — anatomy, genetics, development, physiology and behaviour — all point to the same branching pattern of descent.

Background^ Human Features Shared With Other Great Apes. Humans are one of the great apes, along with chimpanzees, bonobos, gorillas and orangutans. The features we share with them are not a random collection of similarities, but form a nested pattern: humans are most similar to chimpanzees and bonobos, then to gorillas, then to orangutans. That is exactly the pattern expected if all living great apes inherited their similarities from common ancestors.

Anatomical similarities

No external tail: like the other great apes, humans lack an external tail, retaining only the coccyx as a remnant of tailed ancestry.

Similar skeleton: humans and other great apes share the same basic arrangement of skull, spine, ribs, pelvis, shoulders, arms, hands, legs and feet, modified in each lineage for different ways of life.

Flexible shoulders and arms: the mobile shoulder joint, long clavicles and rotating arms reflect an ape ancestry adapted for climbing and reaching.

Hands with nails, not claws: humans and other apes have grasping hands, flattened nails, sensitive fingertips and fingerprints.

Similar teeth: humans and other great apes share the same dental formula — two incisors, one canine, two premolars and three molars in each quarter of the mouth.

Forward-facing eyes: binocular vision gives depth perception, useful in a lineage originally adapted for life in trees.

Genetic similarities

Shared DNA sequences: human DNA is overwhelmingly similar to that of the other great apes, especially chimpanzees and bonobos.

Chromosome 2 fusion: humans have 46 chromosomes, while the other great apes have 48. Human chromosome 2 contains the clear remains of a fusion between two ancestral ape chromosomes.

Shared genetic “mistakes”: humans and other apes share disabled genes, duplicated genes and genetic scars in corresponding positions in the genome. These are hard to explain as separate acts of design, but easy to explain as inheritance from common ancestors.

Endogenous retroviruses: humans and other apes share many ancient viral insertions at the same genomic locations, like inherited molecular fossils.

Developmental and physiological similarities

Similar embryonic development: human embryos develop through the same broad mammalian and primate pattern seen in other apes.

Long gestation and childhood: great apes have relatively long pregnancies, slow development, long dependency and extended parental care.

Single births: humans and other great apes usually give birth to one infant at a time, investing heavily in that offspring.

Similar blood, hormones and immune systems: humans share many physiological systems with other apes, including comparable blood groups, reproductive hormones and immune responses.

Behavioural and cognitive similarities

Social bonding: humans and other great apes form complex social relationships, alliances, hierarchies and long-term bonds.

Facial expressions and gestures: great apes use facial displays, body posture, gestures and vocalisations to communicate emotional and social information.

Play and laughter-like behaviour: humans, chimpanzees, bonobos, gorillas and orangutans all show play vocalisations with shared rhythmic features.

Tool use: several great apes use tools, including sticks, stones, leaves and other objects, showing that human technology is an elaboration of capacities already present in our ape relatives.

Learning and culture: apes can learn socially, pass behaviours through groups, and show local traditions — the biological foundation from which human culture became vastly elaborated.

Taken together, these similarities are not merely superficial. They include shared structures, shared developmental pathways, shared genetic sequences, shared genetic errors and shared behavioural capacities. That is why they are such powerful evidence for common ancestry. A “common designer” explanation can always be asserted after the event, but it does not explain why the evidence falls into the same branching pattern predicted by evolution, including inherited imperfections and molecular accidents.

The paper in Communications Biology was accompanied by a press release from the University of Warwick:

What’s so funny?! Apes and humans have been sharing a laugh for 15 million years
Great apes may have been laughing with a similar rhythm to modern humans for over 15 million years, a University of Warwick study reveals, providing an unexpected clue to how human speech evolved.
All living great apes - chimpanzees, bonobos, gorillas, and orangutans - laugh. But until now, it has been unclear how our laughter may have changed over millions of years of evolution, and how it might relate to the evolution of our speech.

In a new Communications Biology study, Warwick researchers analysed laughter recordings from four orangutans, two gorillas, three bonobos, four chimpanzees, and four humans. Across 140 laughter sequences, they found the same pattern: all species produce laughter with evenly spaced rhythmic intervals between successive sounds.

Video: Dr. Marina Davila-Ross

The researchers propose this basic rhythmic laughing structure was already present in a shared common ancestor 15 million years ago and has remained remarkably conserved with all living great apes and humans still showing the same underlying pattern in their laughter.

How did humans evolve the remarkable ability to speak? Speech leaves no fossils, and complex language exists only in our own species. But we've found a 15-million-year-old clue in an unexpected place: our laughter.

Unlike speech, laughter is shared by all living great apes. By comparing how different species laugh, we can see that a basic rhythmic structure has remained unchanged since our last common ancestor. That's extraordinary.

Dr Chiara De Gregorio, lead author
Honorary Research Associate
Department of Psychology
University of Warwick
Warwick, UK.

However, while the basic rhythm stayed constant between species, the researchers did find that human laughter has become faster, more variable, and has gained sophisticated context-dependent control over time.
Of the great apes, humans alone have the ability to control when and how they laugh depending on context: an uncontrollable laugh when tickled differs sharply from a polite laugh in a meeting, a nervous laugh after a mistake, or the infectious laughter that spreads through a group of friends. The same underlying rhythm, shaped by conscious control to communicate different emotions and intentions.

The findings of this study suggest that throughout great ape evolution, our ancestors gradually developed greater control over the timing of their vocalisations, including laughter – showing a fundamental building block of speech.

It is impossible to assess the precursor forms of language directly from our extinct ancestors. Laughter, being evolutionarily older and having remained shared between all living great apes, provides a rare evolutionary window into the vocal transformations that unfolded across hominid evolution until the first humans appeared on scene.

Contrary to the classic notion that the first humans suddenly acquired vocal control capacities remarkably different from their predecessors, laughter evolution tells us that humans lay on a continuum, a prolongation of vocal control capacities that were already being cumulatively honed in for 15 million years.

Associate Professor Dr Adriano Lameria, co-corresponding author
ApeTank
Department of Psychology
University of Warwick
Warwick, UK.

Photo: Dr. Marina Davila-Ross

Publication:
De Gregorio, C., Davila-Ross, M. & Lameira, A.R.
Rhythm and timing in laughter reveal that human vocal plasticity falls on a hominid continuum. Commun Biol 9, 824 (2026). https://doi.org/10.1038/s42003-026-10499-z

Abstract
Laughter is an important, universal form of human non-linguistic vocal expression and, being shared by all extant great apes, offers a valuable proxy for tracing the evolution of vocal control that ultimately enabled language. Yet surprisingly little is known about the evolution of its defining feature, rhythm. Here we show, through comparative analyses of laughter across all extant great apes (orangutans, gorillas, bonobos, chimpanzees, humans), that the laughter of the last common ancestor was already isochronous, becoming faster, more variable, and increasingly context-sensitive over hominid evolution. The evolution of laughter’s rhythm reveals a progressive increase in vocal rhythmic plasticity, with humans following the overall trajectory toward enhanced vocal control.

Fig. 1: Evolution of temporal patterns of laughter in hominids.

A Probability density function of rhythm ratios (r_k) in the two behavioral contexts (play, in yellow, and tickling in green) derived from 140 laughter bouts across 17 individuals. White lines highlight on‑integer (0.440 < r_k < 0.555, lighter shade) and off‑integer (0.400 <r_k < 0.440 and 0.555 < r_k < 0.600, darker shade) ratio ranges. *Denotes p < 0.05, indicating a statistically significant correspondence between the empirical distribution and a small-integer rhythmic ratio category. B Variation in laughter tempo across species. Each dot represents an individual observation; color indicates phylogenetic distance (in million years ago, MYA). Each square contains an image of the corresponding species, with a matching dot color for intuitive reference. Credits to M. E. Hardus, M. Davila-Ross, E. Demuru. C Variation in laughter tempo across behavioral contexts (play, in yellow, and tickling in green). *Denotes p < 0.05. Sample sizes: n = 4 biologically independent animals for orangutans, n = 2 for gorillas, n = 3 for bonobos, n = 4 for chimpanzees, and n = 4 children.

De Gregorio, C., Davila-Ross, M. & Lameira, A.R.
Rhythm and timing in laughter reveal that human vocal plasticity falls on a hominid continuum. Commun Biol 9, 824 (2026). https://doi.org/10.1038/s42003-026-10499-z

Copyright: © 2026 The authors.
Published by Springer Nature Ltd. Open access.
Reprinted under a Creative Commons Attribution 4.0 International license (CC BY 4.0)

What this research shows, yet again, is that science continues to find evidence of common ancestry in the very details of living organisms. This time it is not bones, teeth, genes or fossils, but the rhythm of laughter itself — a behaviour so familiar and so human that creationists might have assumed it sat safely outside the reach of evolutionary biology. Instead, it turns out to carry the same signature of shared descent as so much else in our anatomy, physiology and behaviour.

For creationists, the problem is not simply that humans laugh like apes, or that apes laugh in ways recognisably related to human laughter. The problem is that the pattern is exactly what evolution predicts: related species sharing inherited features, modified in each lineage according to its own evolutionary history. Humans have elaborated this inherited vocal behaviour into something more flexible, more socially controlled and, eventually, connected to the broader evolution of speech and language. But the raw material was already there, inherited from our ape ancestors.

By contrast, creationism explains nothing. It merely waves the evidence away, or re-labels common ancestry as “common design” after the event. But that manoeuvre simply turns the creationist god into a designer who carefully arranges living organisms, genomes, anatomy and even laughter so that they look exactly as though they evolved. That is not an explanation; it is a confession that the evidence has won and dogma has nowhere else to go.

The laughter of the great apes is therefore more than an amusing curiosity. It is another reminder that humans are not separate from nature, not specially manufactured from dust, and not exempt from the evolutionary history that shaped every other living species. We are modified apes, descended from earlier apes, carrying in our bodies, our genes and even our laughter the evidence of that shared origin.

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