A surprising discovery on a small island in the Baltic Sea is changing how scientists think about the relationship between ancient humans and wolves. Because apparently, even our prehistoric ancestors wanted a furry companion to annoy on long boat trips.
Researchers have identified wolf remains dating back roughly 3,000 to 5,000 years on the Swedish island of Stora Karlsö. The finding is remarkable because the island is isolated and has no native land mammals. The wolves could not have reached the island on their own, leading researchers to conclude that people must have transported them there. Yes, ancient humans apparently looked at a wolf and thought, "This seems like a great idea for a boat ride."
The study, published in Proceedings of the National Academy of Sciences, was conducted by scientists from the Francis Crick Institute, Stockholm University, the University of Aberdeen, and the University of East Anglia. Their findings suggest that prehistoric communities may have been managing or keeping wolves in ways that have rarely been considered before.
The remains were uncovered in Stora Förvar cave, an archaeological site on Stora Karlsö that was heavily used by seal hunters and fishers during the Neolithic and Bronze Ages. Stora Karlsö covers just 2.5 square kilometers and lacks native terrestrial mammals. Because wolves are not capable of naturally colonizing such an island across open sea, researchers believe humans must have brought the animals there, likely by boat.
Scientists examined the remains of two canids, and genetic testing confirmed that both specimens were wolves rather than dogs, with no evidence of dog ancestry. Despite being genetically wolf, the animals displayed several characteristics often associated with living closely with people. Isotope analysis showed that the wolves consumed large amounts of marine protein, including seals and fish, closely matching the diet of the people living on the island. The wolves were also smaller than typical mainland wolves, and one animal showed unusually low genetic diversity, often seen in isolated groups or selectively bred animals.
"The discovery of these wolves on a remote island is completely unexpected," said Dr. Linus Girdland-Flink of the University of Aberdeen, a lead author. "Not only did they have ancestry indistinguishable from other Eurasian wolves, but they seemed to be living alongside humans, eating their food, and in a place they could have only have reached by boat." So basically, ancient humans had pet wolves before dogs were even a thing.
The findings challenge traditional ideas about human-wolf interactions. Scientists have long viewed the relationship through the lens of dog domestication, but these wolves don't fit neatly into that story. "It was a complete surprise to see that it was a wolf and not a dog," said Pontus Skoglund of the Ancient Genomics Laboratory at the Francis Crick Institute. "This is a provocative case that raises the possibility that in certain environments, humans were able to keep wolves in their settlements, and found value in doing so."
Anders Bergström of the University of East Anglia added that one wolf had "exceptionally low genetic diversity," lower than any other ancient wolf seen, similar to what you see in domesticated organisms. "While we can't rule out that these wolves had low genetic diversity for natural reasons, it suggests that humans were interacting with and managing wolves in ways we hadn't previously considered."
One of the most intriguing discoveries involved a Bronze Age wolf that suffered from severe damage to a limb bone, limiting its ability to move and hunt effectively, yet it survived long enough for the condition to leave a clear mark on its skeleton. This may indicate that the animal received some level of care. Because even ancient humans recognized that sometimes you just need to take care of your wolf buddy.
The study combined osteology with advanced genetic analysis. "The combination of data has revealed new and very unexpected perspectives on Stone Age and Bronze Age human-animal interactions," says Jan Storå, Professor of Osteoarchaeology at Stockholm University. Overall, the research suggests that relationships between humans and wolves were far more varied than once believed, pointing to a forgotten chapter in history where experiments in coexistence never produced the dogs we know today, but did result in some very confused wolves on a tiny island.