For years, the mystery of mammoth bone piles scattered across Eurasia and North America has fascinated archaeologists and the public alike. Were these massive accumulations the result of natural disasters, or did Ice Age humans have a hand in creating them? Now, a groundbreaking study published in Current Biology on July 30, 2026, has provided the clearest answer yet: ancient humans were not only responsible for many of these bone beds, but they also showed a surprising preference for hunting female woolly mammoths.
The international team of researchers, drawing on ancient DNA analysis from an impressive 521 woolly mammoth remains—including 448 sequenced for the first time—uncovered a striking pattern. According to Smithsonian Magazine, while the remains of mammoths found in dispersed, natural settings were overwhelmingly male (66% male, 34% female), those found in human-associated bone accumulation sites dated between 20,000 and 30,000 years ago were predominantly female (70% female, 30% male).
This divergence wasn’t just a statistical quirk. As David Díez del Molino, co-senior author of the study and researcher at the Centre for Palaeogenetics, explained to Science X: "By comparing the genetic sex ratios of hundreds of mammoths from natural settings with those found in these archaeological contexts, we can now infer that human activity was the primary driver behind these bone accumulations."
But why did Ice Age hunters focus their efforts on female mammoths? The answer, it turns out, may lie in the social lives of these ancient giants. Drawing parallels with modern elephants, lead author Hannah M. Moots suggested that female-led herds likely moved in more predictable, seasonal patterns across the landscape. "Adult males tend to wander more, whereas female-led herds follow more regular movement patterns, which may have made them easier to locate," Moots told IFLScience. This predictability, rather than a preference for smaller or weaker targets, may have made female herds more accessible to Upper Paleolithic hunters.
Still, hunting a mammoth was no small feat. These animals stood up to 3.7 meters (12 feet) tall and could weigh as much as 8 tons, as noted in IFLScience. Even with sophisticated hunting tools, bringing down such a creature would have required considerable planning and cooperation. "We know that Upper Paleolithic hunter-gatherers sometimes hunted mammoths directly, as evidenced by projectile points embedded in mammoth bones, and they may also have scavenged material from carcasses," said Jarosław Wilczyński, an archaeologist at the Polish Academy of Sciences, via Science X. The use of mammoth resources was extensive: meat and fat for food, hides for clothing and shelter, bones for structures, and ivory for art and tools.
Yet, the story is not as straightforward as it might seem. If, like modern elephants, female mammoths lived in tightly knit matriarchal herds, hunting them could have been risky business. Herds would have defended their young, and coordinated attacks would have been dangerous for both hunter and prey. Still, the predictability of herd movements may have outweighed these risks, making female herds the more frequent targets simply because they were easier to find.
The research team’s approach was ambitious in its scope. By combining genetic data from 100 mammoths at 11 key archaeological sites with 421 individuals from natural settings, they created the largest dataset of its kind. As co-senior author Love Dalén put it to Smithsonian Magazine: "By scaling up sample sizes, ancient DNA can go beyond evolutionary history to teach us about animal behavior and human culture tens of thousands of years ago." This large-scale analysis not only clarified the origins of the bone beds but also offered a rare glimpse into the day-to-day realities of Ice Age survival.
The implications of these findings are significant. As Smithsonian Magazine reported, the strong genetic evidence suggests that many of the massive bone accumulations were indeed the result of human hunting activity. This, in turn, raises difficult questions about humanity’s role in the extinction of the woolly mammoth. Audrey Rowe, a paleoecologist at the University of Alaska Fairbanks, told New Scientist: "The elephant in the room, so to speak, is a new line of evidence that humans contributed to the extinction of mammoths. Sadly, they probably didn’t realize they were contributing to the thinning of their own resources over time."
The study also led to a remarkable genetic discovery. Among the hundreds of mammoth remains analyzed, the researchers identified one individual from Wrangel Island—the last known refuge of the woolly mammoth—with a sex chromosome combination known as X0/XX mosaicism. This condition, called Turner syndrome in humans, occurs when some cells have a single X chromosome and others have two. It’s the first time such a genetic anomaly has been documented in an extinct species. Moots described the find as unexpected and exciting, telling IFLScience: "We certainly weren't expecting to find this, but it was really exciting." She added, "It's also difficult to know whether there would have been any visible physical differences at all." In other mammals, such as horses, X0 individuals often show no obvious external differences but may be infertile due to ovarian abnormalities.
How did scientists make such a discovery? Díez del Molino credited recent advancements in DNA sequencing and improved reference genomes. "This really wouldn't have been possible until the last couple of years. The combination of improved reference genomes and new ancient DNA methods is what made this discovery possible," Moots commented to IFLScience. These technological leaps have opened a new window into the biology and social lives of extinct animals, allowing researchers to ask questions that would have been unthinkable even a decade ago.
The study’s findings have sparked debate within the scientific community. Some experts, like Julia Gresky at the German Archaeological Institute, see the documentation of Turner syndrome in mammoths as a natural extension of what we know about mammalian genetics. "But of course, we’re all mammals. So why wouldn’t they have genetic mutations like we do?" she remarked to New Scientist. Others, like Rowe, focus on the broader ecological implications, wondering how human predation may have contributed to the mammoth’s eventual disappearance.
As researchers continue to analyze ancient DNA, isotopic data, and archaeological evidence, new details about the relationship between humans and mammoths are sure to emerge. For now, this study stands as a testament to the power of modern science to unravel mysteries buried for tens of thousands of years—and as a reminder of the complex, sometimes unintended consequences of human ingenuity.
With every new bone and genome sequenced, the story of the woolly mammoth becomes a little clearer, bringing us closer to understanding not just how these majestic animals lived and died, but also how our own ancestors shaped the world around them.