Ancient human hunters and scavengers deliberately targeted female woolly mammoths over males between 20,000 and 30,000 years ago, according to a genetic analysis of more than 500 fossils published in Current Biology. The study reveals that matriarchal herds offered predictable seasonal routes, fundamentally shifting our understanding of Upper Palaeolithic hunting strategies.
DNA Analysis Reveals a Striking Gender Imbalance in Ice Age Fossil Sites
For decades, researchers debated whether massive accumulations of mammoth bones found near ancient human settlements were the result of organized hunting or merely natural graveyards where people set up camp to scavenge bones, ivory, and meat. To settle the question, researchers led by David Díez del Molino and Hannah Moots at the Centre for Palaeogenetics in Stockholm, Sweden, turned to ancient DNA.
The team sequenced specimens from 448 mammoths—predominantly teeth—and analyzed previously sequenced DNA data from another 73 animals. This combined dataset covered 521 ancient woolly mammoths (Mammuthus primigenius) gathered across Eurasia and North America. By determining the genetic sex of each specimen, the researchers uncovered a profound divergence between where animals died naturally and where humans interacted with them.
Solitary adult bulls roamed more widely and frequently fell into natural traps, behaving much like modern male elephants, bison, and brown bears. By sharp contrast, 70 per cent of the mammoth remains recovered from human-related archaeological sites belonged to females.
Why Ice Age Hunters Found Female Herds Easier to Track
The heavy skew toward female remains at habitation sites does not automatically mean that hunters deliberately sought out smaller animals. Instead, experts point to the social organization of the herds. Woolly mammoths lived in matriarchal groups comprising adult females and juveniles of both sexes, which moved across the landscape along dependable seasonal migration routes.
Because solitary males wandered unpredictably, encountering them was largely a matter of chance. Female-led herds offered a reliable food source for communities whose survival depended on large game. Furthermore, living elephants provide a behavioral blueprint for why these groups were vulnerable. As retired anthropologist Pat Shipman observed, female elephants protect their young by forming a protective barrier with their bodies, which can inadvertently make mothers easier to target.
Other specialists framed the dynamic as a matter of efficiency. Audrey Rowe at the University of Alaska Fairbanks noted that female mammoths were the path of least resistance for Palaeolithic hunters who relied on predictable migration corridors. Rather than chasing scattered bulls across vast expanses of the tundra, hunters could station themselves along established routes and coordinate complex ambushes, potentially using terrain features like mud or bogs to immobilize the animals.
A Rare Genetic Discovery on Wrangel Island
Alongside the demographic shift in hunting patterns, the international research team stumbled upon a completely unexpected biological milestone: the first genetic sex chromosome mutation ever identified in an extinct species. Among the analyzed fossils, one mammoth originating from Russia’s Wrangel Island displayed an X0/XX mosaicism pattern. This condition, which involves cells lacking one of their sex chromosomes, is the genetic equivalent of Turner syndrome in humans.
While this chromosomal anomaly occurs in modern domestic animals, it had never before been documented in elephants or extinct megafauna. Julia Gresky of the German Archaeological Institute in Berlin expressed amazement at the find, noting that mammals share fundamental biological mechanisms regardless of extinction status. Researchers remain cautious about what the mutation signifies, emphasizing that it remains unclear whether the anomaly was connected to the eventual genetic bottleneck of the small, isolated Wrangel Island mammoth population or simply a random developmental event.
Broader Implications for Human-Driven Extinction Debates
The realization that ancient humans systematically targeted female-led breeding groups adds a sobering dimension to discussions surrounding megafaunal collapse. By removing breeding females from the population over millennia, hunting pressure likely accelerated the decline of the species far beyond what natural environmental shifts alone might have caused.
As Rowe pointed out, the findings highlight a tragic ecological feedback loop where ancient communities relied heavily on a resource while unknowingly contributing to the thinning of their own means of survival over time.
