Tumat, northeastern Russia – It was an extraordinary chain of circumstances that allowed paleontologists a unique glimpse into the past. About 14,000 years ago, a wolf pup fed on the meat of a woolly rhinoceros and died shortly afterward itself. Thanks to rapid preservation in Siberian permafrost, the animal’s stomach contents have been preserved to this day, providing valuable genetic information.
During the last Ice Age, massive animals such as mammoths and woolly rhinoceroses still roamed Europe and northern Asia. These Ice Age giants occasionally fell prey to predators like wolves or bears. In the stomach of the remarkably well-preserved wolf pup, researchers found fur-covered meat remains of a woolly rhinoceros. The report was published on January 15, 2026. From this material, the team led by Sólveig Gudjónsdóttir at the Centre for Palaeogenetics in Stockholm succeeded in decoding the complete genome of the herbivore—something entirely new, as it represents the first genome reconstruction ever obtained from stomach contents.
The genetic analysis produced surprising results. The examined woolly rhinoceros showed high genetic diversity. When compared with two other woolly rhinoceros genomes dating back 18,500 and 48,500 years, there was neither evidence of genetic depletion nor an increase in harmful mutations. This suggests that the species still had sufficiently large populations at the time and was not yet weakened by long-term inbreeding.
These findings are important for the debate surrounding the extinction of Pleistocene megafauna. For a long time, it was unclear whether climate fluctuations at the end of the Ice Age or human hunting were the main cause. Since humans had already been living in northeastern Siberia for about 15,000 years, overhunting was also considered a likely explanation. However, the new genetic data suggest that the woolly rhinoceros did not die out gradually, but that its population collapsed relatively suddenly.
The researchers suspect that the decisive factor was the Bølling–Allerød interstadial, a period of rapid warming in the Northern Hemisphere that dramatically altered the habitats of cold-adapted animals. The woolly rhinoceroses were probably unable to adapt sufficiently to these rapid climate changes.
That such insights are possible today is due to a fortunate coincidence. The wolf pup died shortly after its meal, before the meat was fully digested. Rapid freezing in the permafrost preserved the DNA almost intact. Using modern sequencing techniques, the genetic material could ultimately be analyzed in detail—offering a rare glimpse into a world long gone.
Heiner Kubny, PolarJournal