Elongated, “alien-like” skulls unearthed in ancient burial sites around the world have puzzled observers for centuries. But researchers say these unusual remains are not evidence of disease or extraterrestrial contact.
Instead, they reflect a deliberate and widespread tradition of reshaping infants’ heads, a practice known as cranial vault modification, found in archaeological sites across Europe, the Near East, Africa, Asia, Oceania, and the Americas.
The earliest confirmed example of this custom comes from Kow Swamp in the Australian state of Victoria, where researchers recovered a pair of deliberately flattened skulls dating back at least 13,000 years.
Tyler O’Brien of the University of Northern Iowa said that the practice then surfaced independently across the globe: roughly 12,500 years ago in parts of Europe, around 11,000 years ago in China, and close to 10,000 years ago in the region that is now Iran.
No single explanation fits every culture
Because the custom appeared at so many different times and in so many places, researchers caution against applying a single explanation. Matthew Velasco of the University of North Carolina at Chapel Hill said the meaning behind the practice almost certainly shifted depending on the culture and the era.
In some societies, head shape may have served as a marker of group belonging. Christine Lee of the University of Mississippi noted that among the Indigenous Caddo of Oklahoma, distinct shapes appear to have corresponded with different clans.
Yet Velasco’s DNA research among extended families buried together in the Andes has revealed that even biological relatives sometimes had very different head shapes, which suggests the practice did not follow a single rigid rule.
How caregivers shaped infant heads
The procedure itself was relatively straightforward. Since an infant’s skull bones are soft and still forming, caregivers could guide growth by wrapping cloth around the head to encourage a flatter or more conical profile.
Christina Torres of the University of California, Riverside, said this simple binding method was the most commonly used approach, though researchers have catalogued a wide variety of tools and techniques across different cultures.
O’Brien wrote that the work was most likely carried out by mothers or midwives, and records from practising groups indicate it typically started when a baby was around six months old and lasted no more than a couple of years.
Despite its striking results, the practice does not appear to have been especially dangerous. Torres said she knows of just a single case in which researchers believe a child’s death may have been linked to excessive compression of the skull, and she called that outcome highly unusual.
O’Brien similarly argued that sensational accounts from colonial-era travellers in the Andes, Borneo and Vanuatu were almost certainly overblown. Lee added that the more realistic risks would have involved bindings that were kept too tight or left unchanged for too long, potentially causing scalp infections or jaw problems.
Health risks and colonial misunderstandings
When European explorers first encountered the practice, their reactions were far from objective. Spanish accounts from the Andes described the custom in alarming and graphic language, but Torres said the physical evidence does not back up those dramatic claims.
Pilar Zabala Aguirre of the Autonomous University of Yucatán, who has reviewed more than a hundred Spanish records, found that explorers attributed the practice to everything from ethnic identity and military rank to courage and beauty standards. Scholars today say many of these early interpretations were coloured by racist assumptions and a conviction that Western ways were superior.
Modern researchers rely on more rigorous methods. Archaeologists assess whether a skull was intentionally modified by taking three-dimensional measurements of its width, length and height and comparing the ratios against the range of natural human variation.
The underlying technique, craniometry, dates to the 19th century, when figures like Samuel Morton used skull data to construct racial hierarchies that have long since been discredited. Today’s practitioners apply the same measurements with very different aims and far less bias.
The geographic record of cranial modification is uneven, and preservation plays a role. Velasco noted that the Americas dominate the archaeological literature on this topic partly because the cool, dry climate of the Andes protected mummified remains exceptionally well. That does not necessarily mean the practice was more common there than elsewhere.
Was the shape always the goal?
Some of the most intriguing recent findings question whether the final head shape was always the point. Torres suggested that in parts of the Andes, the act of wrapping and binding may have mattered more than the resulting silhouette.
She said the timing of the practice, around the age when babies begin teething and transitioning to solid foods, hints that it may have functioned as a child-rearing ritual or a rite of passage.
Velasco pointed out that the idea may even trace back to a universal human experience: an infant’s skull naturally changes shape as it passes through the birth canal, presenting every parent with visible proof that the head is malleable.
The tradition persisted well into recent history. Communities in Papua New Guinea, Congo and parts of France continued forms of infant head shaping into the 20th century.
That long and geographically diverse record, researchers say, places cranial modification firmly within the broader human tradition of body modification rather than treating it as an exotic anomaly.
Velasco argued that the practice is best understood as one of the many ways societies have invested meaning, care, and identity in their children.
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