New evidence from a cave in southern Türkiye suggests that Neanderthals and early modern humans lived in strikingly similar ways and shared symbolic traditions across a span of more than 20,000 years. The study, published in the Proceedings of the National Academy of Sciences in July 2026, draws on tools, animal bones and seashells from Üçağızlı II Cave, and it dovetails with genetic research that has already shown the two groups interbred. The cultural overlap, though, comes from artifacts rather than DNA itself.
Why a cave in Türkiye is so revealing
Üçağızlı II Cave sits on Türkiye’s Mediterranean coast, along what was a key route between Africa and Eurasia during the Late Pleistocene. That location matters because it placed both Neanderthals and incoming modern humans on the same corridor during the period when Homo sapiens was spreading out of Africa. A site occupied by both groups, one after the other, offers a rare chance to compare how each lived in the same place under similar conditions.
The debate the study speaks to is a long-running one: how much did Neanderthals and modern humans actually interact, and how much did each borrow from the other? Genetic studies have established that interbreeding occurred, leaving Neanderthal DNA in the genomes of people outside Africa today. What has been harder to pin down is whether the two groups also shared behaviors and ideas, the kind of cultural exchange that does not show up in a genome but can appear in the objects people left behind.
What the excavation actually found
An international team spent five years digging through the cave layer by layer with millimeter-level care, recovering fossils, stone tools, animal bones and seashells left by both human groups. They identified which species occupied the cave by studying the inner structure of fossilized teeth. Dating showed Neanderthals used the cave between roughly 77,000 and 59,000 years ago, and Homo sapiens lived there from about 59,000 to 47,000 years ago, a combined sequence spanning well over 20,000 years.
The most telling result was how little changed when one population replaced the other. Both groups made the same types of stone tools from local flint, and both hunted the same animals, including wild goats, fallow deer, roe deer and wild boar. Their food choices and hunting methods stayed much the same across thousands of years, which the researchers interpret as continuity rather than coincidence.
One find stood out. Archaeologists recovered 29 shells from the sea snail Columbella rustica, a species with almost no food value. Several had small holes, suggesting they were worn as ornaments, and one shell from the Neanderthal layers had been deliberately heated to change its color before use. Similar shell ornaments had once been treated as a marker unique to modern humans, so finding that Neanderthals used them too undercuts the idea that symbolic decoration was a Homo sapiens invention.
How strong is the “shared culture” claim
The researchers argue that these shared habits point to cultural contact, with ideas and traditions passing between the two groups. Importantly, they do not claim the two peoples lived in the cave at the same time. Neanderthals and modern humans occupied Üçağızlı II at different periods, but they shared the same region during overlapping windows, and the team believes that regional coexistence is what allowed practices to be transmitted. That is a more careful claim than direct, face-to-face teaching, and it should be read that way.
The Türkiye findings fit a broader pattern emerging from other sites. Research at Tinshemet Cave in Israel has found similar signs of shared behavior between Neanderthals and modern humans, reinforcing the picture of a Levant where the two groups’ lives closely resembled one another. But the evidence is not uniform. At Mandrin Cave in France, the two groups occupied the same place at different times without leaving the same pattern of shared culture, a reminder that the dynamic likely varied by region.
Several questions remain unresolved, and the study’s authors say so. It is still unclear where these shared traditions began and how they spread, and whether the cultural exchange was directly linked to the interbreeding that genetics has documented. It is worth being precise about the evidence, too: the shared-culture argument here rests on stone tools, hunting patterns and ornamental shells, while the DNA connection is a separate, previously established line of research about interbreeding. Conflating the two overstates what any single cave can show.
For readers, the takeaway is a shift in how the Neanderthal story is framed. Rather than a primitive group swept aside by more sophisticated newcomers, the picture from Üçağızlı II is of two closely related human populations whose daily lives and symbolic practices were far more alike than once assumed, right up until Neanderthals disappeared around 40,000 years ago. What to watch is whether further work at the cave and comparable sites can trace where those shared traditions originated, and whether they can finally be tied to the genetic mixing that the fossils and genomes both record.
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*This article was researched with the help of AI, with human editors creating the final content.
