Roughly one in seven people can fold their tongue into a cloverleaf shape, making it one of the rarer tongue tricks in the human repertoire. A study of a Dutch population put the figure at about 15%, which is far less common than simple tongue rolling but more common than many people assume. The real story is more interesting than a single number, though, because how researchers measure this ability, what other tongue movements relate to it, and whether you can train yourself to do it all complicate the picture.
What a Cloverleaf Tongue Actually Looks Like
The cloverleaf tongue, sometimes called a trefoil or three-leaf clover tongue, involves folding both lateral edges of the tongue upward while simultaneously pressing the tip downward (or vice versa), creating three distinct lobes that resemble a clover leaf. It is not the same as tongue rolling, where you curl both sides upward to form a tube, and it is not the same as simple tongue folding, where you fold the tip of the tongue backward onto itself. The cloverleaf requires independent control of at least three different segments of the tongue at once, which is why far fewer people can pull it off compared to rolling or folding.
The Numbers on Cloverleaf Prevalence
The best recent estimate comes from a study that tested tongue movements in a healthy Dutch population and verified each movement through direct observation rather than self-report. About 14.7% of participants could produce a cloverleaf shape.1PubMed Central. Five Specific Tongue Movements in a Healthy Population To put that in context, the same study found that about 84% could roll their tongue, roughly 28% could fold it, and about 36% could twist it to the left or right. The cloverleaf was the least common movement tested. So if you can make a cloverleaf, you belong to a minority, but not a vanishingly small one. In a room of twenty people, two or three can probably do it.
These figures are notably higher than older estimates that sometimes circulated in genetics textbooks and popular science writing. Earlier surveys, often conducted with self-report questionnaires rather than direct observation, put tongue folding as low as 3% of the population. The Dutch study found the actual folding rate was almost ten times higher than that older figure, and the researchers noted that the discrepancy was likely due to methodology. When people are simply asked whether they can perform a movement, many get it wrong in both directions: some claim abilities they cannot actually demonstrate, and others underestimate what they can do.1PubMed Central. Five Specific Tongue Movements in a Healthy Population
How Cloverleaf Compares to Other Tongue Tricks
Tongue rolling is by far the most common tongue movement. With roughly four out of five people able to do it, rolling barely qualifies as a trick. Twisting the tongue to one side or the other sits in the middle of the range at about a third of the population. Simple folding (bending the tip backward) comes in around a quarter to a third, depending on the population studied. A study of 2,000 individuals in Quetta, Pakistan found that about 36% could fold their tongue, with a slightly higher rate among males than females.2World Journal of Zoology. Tongue Rolling, Folding, Cheek Dimple and Chin Cleft; Study of a Morphogenetic Traits in Quetta Population The cloverleaf sits at the bottom of the list at around 15%, making it genuinely uncommon though not extraordinary.
There is a loose hierarchy at work here. Simple movements that require less independent control of different tongue regions, like rolling, are common. Movements that demand the tongue to do different things in different zones simultaneously, like the cloverleaf, are rare. This makes intuitive sense given the muscular coordination involved.
Do These Tongue Movements Travel Together?
You might expect that someone who can do one tongue trick is more likely to do another, and there is some truth to that, but the relationships are selective rather than universal. A study of tongue movement traits in a Han Chinese population found that only three out of ten possible pairs of tongue movements were correlated with each other. Tongue rolling and tongue folding were linked, as were pointed tongue and rolling, and folding and pointed tongue.3PubMed. The traits of five types of tongue movement in Han of Shaanxi, China Most pairs of movements showed no meaningful connection.
One old assumption was that you need to be able to roll your tongue before you can fold it or make a cloverleaf, as though rolling were a prerequisite skill. The Dutch study directly contradicted this: the ability to roll the tongue was not a prerequisite for folding.1PubMed Central. Five Specific Tongue Movements in a Healthy Population Some people who cannot roll can fold, and some who can fold cannot roll. The movements seem to draw on partially overlapping but distinct neuromuscular circuits.
Why Some People Can Do It and Others Cannot
The tongue is one of the most muscularly complex structures in the body. It contains multiple intrinsic muscles that can change its shape without moving its base, and several extrinsic muscles that anchor it to the jaw, skull, and hyoid bone. Making a cloverleaf shape requires contracting at least two sets of intrinsic muscles in opposing patterns: the lateral edges curl up while the midline stays low, or vice versa. This demands a level of independent motor control that not everyone’s brain-tongue wiring supports equally.
Research on the neural pathways controlling the tongue has shown that stimulating the motor cortex produces responses on both sides of the tongue at nearly identical speeds. This bilateral wiring means your brain talks to both halves of your tongue simultaneously through fast, direct connections.4PubMed. Tongue motor responses following transcranial magnetic stimulation of the motor cortex and proximal hypoglossal nerve in man For most tongue movements, bilateral activation is fine. But the cloverleaf essentially requires the brain to break that bilateral symmetry and control the left edge, right edge, and center of the tongue independently. Not everyone’s motor cortex can do this with the precision and separation required, regardless of how hard they try.
The Genetics Question
Tongue rolling was famously used for decades in genetics classrooms as an example of a simple dominant trait. That story has largely fallen apart. Studies of identical twins have found pairs where one twin can roll and the other cannot, which should be impossible if the trait were controlled by a single gene with complete dominance. The genetics of tongue rolling turned out to be far messier than anyone taught in introductory biology classes.
The cloverleaf has received even less genetic attention than rolling, and there is no solid evidence that it follows a simple inheritance pattern. The Dutch population study found no relationship between gender or handedness and the ability to perform any of the five tongue movements tested.1PubMed Central. Five Specific Tongue Movements in a Healthy Population The absence of a sex difference argues against a simple X-linked pattern, and the overall prevalence of about 15% does not neatly fit any single-gene model. Most researchers who study tongue movement now treat these abilities as complex traits influenced by multiple genes, tongue anatomy, and possibly practice or environmental factors during development.
If your parents can both make a cloverleaf, you have better odds of being able to do it yourself, but it is far from guaranteed. And if neither parent can, you might still be able to. This is the hallmark of a trait that is polygenic or heavily influenced by non-genetic factors. Treating the cloverleaf as a Mendelian trait in a classroom is an oversimplification that no longer holds up.
Can You Learn the Cloverleaf Through Practice?
This is where the evidence gets frustratingly thin. There are plenty of anecdotal reports from people who claim they taught themselves to make a cloverleaf through weeks or months of practice, and YouTube tutorials on the topic are surprisingly popular. But controlled studies that track whether non-cloverleaf individuals can acquire the ability over time are essentially nonexistent.
What we do know is suggestive. The fact that older prevalence figures for tongue folding were so much lower than modern verified figures (3% versus about 28%) hints that many people simply never tried or never learned the specific muscle activation pattern.1PubMed Central. Five Specific Tongue Movements in a Healthy Population If a large number of people can fold their tongue when they actually attempt it in a structured setting but never knew they could, it is at least plausible that some people could learn the cloverleaf with deliberate practice. The tongue, after all, responds to motor training in other contexts: speech therapy, instrument playing (wind and brass musicians develop remarkable tongue control), and swallowing rehabilitation all involve teaching the tongue new patterns of movement.
That said, there are likely hard anatomical limits for some people. If the underlying muscle fiber arrangement or the neural branching pattern does not support independent segmental control, no amount of practice will overcome that. The honest answer is probably that some non-cloverleaf individuals could learn it and others genuinely cannot, but nobody has done the work to figure out what percentage falls into each group.
When Anatomy Gets in the Way
One physical factor that clearly restricts tongue mobility is the lingual frenulum, the small fold of tissue connecting the underside of the tongue to the floor of the mouth. When this frenulum is abnormally short or tight, a condition called ankyloglossia or tongue-tie, it limits the tongue’s range of motion. Research has shown that people with moderate ankyloglossia had limited tongue mobility about 29% of the time, while those with severe ankyloglossia had limited mobility about 71% of the time.5PubMed Central. Influence of Shortened Tongue Frenulum on Tongue Mobility, Speech and Occlusion People with mild ankyloglossia had normal mobility, as did controls.
Ankyloglossia is relatively common, affecting an estimated 4 to 10% of newborns depending on how strictly it is defined. For someone with a moderate or severe case that was never surgically corrected, making a cloverleaf may be physically impossible regardless of their neuromuscular potential. The frenulum constrains the tongue’s upward and lateral movement, exactly the kind of range needed for the cloverleaf shape. If you have tried and failed to make a cloverleaf, it is worth checking whether your tongue can comfortably touch the roof of your mouth and extend past your lower lip. If it cannot, the frenulum might be the limiting factor.
People Are Surprisingly Bad at Judging Their Own Tongue
One of the more entertaining findings from the Dutch study was how poorly people predicted their own abilities. About 10% of participants incorrectly believed they could demonstrate tongue rolling when they actually could not. Even more striking, roughly 13% incorrectly assumed they could make a cloverleaf before being tested.1PubMed Central. Five Specific Tongue Movements in a Healthy Population Since the actual cloverleaf rate was about 15%, this means almost as many people wrongly thought they could do it as actually could.
This self-assessment problem has practical implications beyond party tricks. Tongue mobility assessments are used in speech pathology, dysphagia evaluation, and pre-surgical screening for conditions affecting the oral cavity. If clinicians rely on patients’ self-reports of what their tongue can do, they may get inaccurate information nearly a third of the time for some movements. Direct observation and standardized testing protocols are necessary for any clinical context where tongue mobility matters.
Population Variation and Gaps in the Data
Most of the solid prevalence data for the cloverleaf comes from a handful of studies in European and Asian populations. The Dutch study provides the most methodologically rigorous figure (about 15%), while Chinese and Pakistani datasets offer useful comparison points for related tongue movements.3PubMed. The traits of five types of tongue movement in Han of Shaanxi, China 2World Journal of Zoology. Tongue Rolling, Folding, Cheek Dimple and Chin Cleft; Study of a Morphogenetic Traits in Quetta Population But large-scale studies from African, South American, or Oceanian populations are scarce to absent for the cloverleaf specifically.
Given that tongue anatomy, frenulum length, and the underlying genetics all vary across ethnic groups, it would be surprising if the 15% figure held precisely everywhere. The true global prevalence of the cloverleaf is genuinely unknown. It could plausibly range from 10% to 20% or wider, depending on the population. Anyone who cites a single universal number for this trait is overstating the certainty of the evidence.
Why Tongue Tricks Persist in Popular Science
Tongue rolling and its fancier cousins like the cloverleaf have been staples of genetics education and science fair projects for decades, despite the science behind their inheritance being weaker than almost any textbook admits. The appeal is obvious: these are traits you can test instantly with no equipment, they feel binary (you either can or you cannot), and they seem like clean examples of dominant-versus-recessive inheritance. The problem is that none of those convenient properties actually hold up under scrutiny. The cloverleaf is not binary (people exist on a spectrum from a barely recognizable fold to a crisp three-lobed shape), the inheritance is not simple, and the prevalence changes depending on how you measure it.
Researchers who study tongue movements today tend to be interested in them for clinical reasons rather than genetic pedagogy. The tongue’s ability to make specific shapes and movements is a useful proxy for the health of its motor pathways, and establishing baseline rates for movements like the cloverleaf helps clinicians identify when something has gone wrong with the nerves, muscles, or connective tissue of the oral cavity. In that context, the cloverleaf’s rarity is less a curiosity and more a practical benchmark: if your patient used to make a cloverleaf and now cannot, something has changed in their tongue’s neuromuscular control that warrants further investigation.