Yes, Neanderthals are extinct. They vanished from the fossil record roughly 40,000 years ago, after thriving across Europe and western Asia for more than 350,000 years. But calling them simply “gone” misses something remarkable: a piece of them survives in the DNA of most people alive today. People of European or Asian descent carry about 1 to 2 percent Neanderthal DNA, and even African populations retain trace amounts.
When and Where the Last Neanderthals Lived
Neanderthals first appeared around 400,000 years ago and occupied a wide range stretching from the Atlantic coast of Europe into central Asia. As their numbers declined, that range shrank. The most recent fossils come from small pockets of southwestern Europe and the Near East.
The latest confirmed Neanderthal occupation site in the world is Gorham’s Cave on the coast of Gibraltar, where radiocarbon dating of a Mousterian hearth (a type of stone-tool culture unique to Neanderthals) places their presence at around 28,000 years ago, possibly as recently as 24,000 years ago. By that point, modern humans had already been living across much of Europe for thousands of years. Gibraltar’s mild, resource-rich coastline likely offered one of the last refuges where a small population could hang on.
Why They Disappeared
Two main hypotheses compete for the explanation. One points to climate instability during the late Ice Age, when rapid temperature swings may have disrupted the ecosystems Neanderthals depended on. The other points to competition with modern humans, who were expanding into Neanderthal territory during the same period.
A detailed analysis of Neanderthal range contraction found that their retreat into southwestern Europe coincided not with a climate shift but with the geographic expansion of modern humans into those same regions. In other words, it was the arrival of a competing species, not a cold snap, that appears to have driven them south and ultimately to extinction. That said, the two pressures likely reinforced each other. A population already stressed by environmental change would be especially vulnerable to competition for food and shelter.
Neanderthal populations were also small and fragmented compared to modern human groups, which made them more susceptible to local die-offs. Losing even a few dozen individuals from an isolated group could push it past the point of recovery.
They Were More Like Us Than You’d Think
The old image of Neanderthals as dim, brutish cavemen doesn’t hold up. In raw terms, their brains were about the same size as ours. Fossil measurements from Neanderthals and modern humans living between 27,000 and 75,000 years ago show virtually identical average brain volumes, roughly 1,474 cubic centimeters for both. However, when researchers adjusted for Neanderthals’ larger body size and bigger visual processing areas (an adaptation to Europe’s lower light levels), the portion of the brain available for higher cognition was significantly smaller in Neanderthals than in contemporary modern humans.
Still, Neanderthals used sophisticated stone tools, employing the same core knapping technique as early modern humans to produce sharp, standardized flakes. They buried their dead, sometimes with grave goods, and archaeological comparisons of Neanderthal and early modern human burials in the Levant (the eastern Mediterranean region) show similar practices in body positioning and the inclusion of offerings, though with differences in where within caves they placed burials and what objects they chose. These are not the behaviors of a mindless species.
Interbreeding With Modern Humans
Neanderthals didn’t simply vanish without a trace. Genome sequencing over the past decade has confirmed that modern humans and Neanderthals interbred on multiple occasions. Modern humans who lived around 40,000 years ago carried as much as 6 to 9 percent Neanderthal DNA, a proportion that has diluted over thousands of generations to the 1 to 2 percent seen today in people of European and Asian ancestry. A 2020 study also identified Neanderthal DNA in African populations, likely carried back into Africa by humans who had already mixed with Neanderthals elsewhere.
Gene flow went both directions. Researchers have found evidence of modern human DNA entering the Neanderthal genome as well, meaning these encounters were not rare, isolated events. A striking example of how common interbreeding was among ancient human groups comes from a bone fragment found in Denisova Cave in Russia. DNA analysis revealed it belonged to a girl, nicknamed “Denny,” whose mother was Neanderthal and whose father was Denisovan (a separate archaic human group). Finding a first-generation hybrid among the tiny number of ancient fossils that have been genetically sequenced suggests that mixing between groups was routine whenever they came into contact.
Neanderthal DNA Still Affects Your Health
The Neanderthal genes that persist in modern humans are not just genetic souvenirs. They actively influence traits related to the immune system, skin, and even the brain. One of the clearest effects involves disease resistance: when humans and Neanderthals interbred, they exchanged genes that provided resistance to local pathogens, giving hybrid offspring a survival advantage.
Large-scale genetic studies have linked Neanderthal gene variants to a range of modern health conditions. Some Neanderthal alleles affect how skin responds to sun exposure, contributing to the risk of a common sun-related skin condition called actinic keratosis. Others have been associated with neurological and psychiatric traits, as well as aspects of immune function. In many cases, these genes were beneficial tens of thousands of years ago, helping humans adapt to colder climates, different diets, or unfamiliar diseases, but carry different consequences in modern environments.
Extinct as a Species, Not as a Lineage
Neanderthals are gone as a living, breathing population. No distinct Neanderthal community has existed for at least 24,000 years, and likely longer. But calling them entirely extinct requires an asterisk. Their genes circulate in billions of people, influence real health outcomes, and continue to be the subject of new discoveries as ancient DNA technology improves. In a strict biological sense, a fraction of the Neanderthal genome was absorbed into our own species rather than lost. They disappeared as a people but left a permanent mark on the human gene pool.