For hundreds of thousands of years, modern humans lived alongside other kinds of humans, long before cities or writing. Neanderthals were one of these groups—distinct, sophisticated people who lived during the Ice Age. Their range stretched from present-day Spain and Gibraltar to the Altai Mountains of Central Asia. About 40,000 years ago, for reasons we can only guess, they disappeared.
Neanderthal Appearance
Neanderthals were not our ancestors, but our genetic cousins. They adapted to the brutal Ice Age climates of Europe and Asia, developing stocky, powerful bodies suited to cold conditions, along with large noses and heavy brow ridges. These features may have helped warm cold air before it reached their lungs. Their skulls show larger braincases than modern humans, but because soft tissue does not fossilize, we cannot know how their brains functioned. The structure of their throats indicates they could speak, though we know nothing of their language. Despite these skeletal differences, Neanderthals might not have looked dramatically different from modern humans in life.Neanderthal DNA in Modern Humans
Until recently, researchers believed that Neanderthals did not breed with modern humans. DNA research that began around 2010 found another story. People whose ancestors lived in Europe or western Asia carry between 1% and 2% Neanderthal DNA.
While the genetic evidence is undeniable, we don’t know how modern humans interacted with Neanderthals. In the animal kingdom, closely related species such as coyotes and wolves tend to avoid one another. They very occasionally interbreed, but often only when individuals cannot find mates of their own kind.
Tools, Fire, and Ice Age Survival
Neanderthals hunted large Ice Age animals, including bison, horses, deer, and sometimes mammoths, and also ate plants, nuts, and fish. They shaped stone tools into knives and spear points. Some tools came from as far as 50 miles away, suggesting trade among groups. They heated birch bark over controlled fires to make sticky tar. This tar served as glue to attach stone tools to wooden handles. They created art and sometimes buried their dead. Neanderthals lived much like modern humans of their time.
Daily Life of the Neanderthals
Neanderthals were foragers who traveled in small family units in search of food, establishing camps in caves and open areas. They used fire for cooking, warmth, and protection. Many fossils show severe injuries, likely from hunting animals at close range. Injuries appear among women and older children as well as men, suggesting females hunted alongside males. Some lived for years with blindness or crushed limbs and survived long after they could no longer hunt. This suggests strong family bonds and care for one another.
The Mystery of their Extinction
The Neanderthal population was likely small and scattered, perhaps no more than 50,000 people across 4,000 miles at any given time. Our genetic cousins gradually disappeared over about 10,000 years, and we don’t know why. Scientists think climate change may have made survival harder for people adapted to cold conditions. As their numbers declined, groups may have become isolated from one another.
Other Human Species
Neanderthals were not the only other humans who lived beside our ancestors. Other ancient humans lived in Indonesia, where researchers discovered a human species only 3½ feet tall. They nicknamed Homo floresiensis the “hobbit.” We know almost nothing about another human group called the Denisovans, because only a few bones have been found. Denisovan DNA lives inside many people today. In parts of Asia and the Pacific, some populations carry Denisovan DNA, just as Europeans carry Neanderthal DNA.
Ghost DNA
Geneticists say many of us carry what scientists call “ghost DNA.” These are genetic traces not identified as modern human, Neanderthal, or Denisovan. This suggests other kinds of humans once lived on Earth whose remains we have not found. DNA inside all of us may hold the key to someday understanding more of the human story.
The First Neanderthal Fossils
In 1856, laborers were digging into a limestone cliff in the Neander Valley near Düsseldorf in western Germany. They were quarrying the limestone to make cement when they uncovered what they believed were ancient human bones. Scientists at first thought the bones belonged to a modern human who had suffered from disease or deformities.
For the next several years, German scholars debated the find. Some believed the bones belonged to a different human species, while others argued that there could be no other human species. Without a scientific framework for ancient humans, researchers struggled to explain the unusual shape of the skull.
The debate began to change after Charles Darwin published On the Origin of Species in 1859. Darwin did not say directly that humans evolved, but his theory showed that plants and animals could change over long periods of time. Many researchers soon realized that humans might also have ancient relatives.
Over time, archaeologists uncovered many more Neanderthal fossils. Today, Neanderthal remains have been found at more than 300 sites across Europe and western Asia. Scientists now have the fossils of several hundred Neanderthal individuals. These later discoveries confirmed that the bones found in the Neander Valley in 1856 belonged to a widespread and successful group of ancient humans.
Resources
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Mr. Donn has an excellent website that includes a section on Prehistory.
Cite this page:
Dowling, Mike, “Neanderthals,” mrdowling.com, September 17, 2026. Web. [Date of access].
Sources:
William King, “The Reputed Fossil Man of the Neanderthal,” Quarterly Journal of Science, vol. 1 (1864)
Richard E. Green et al., “A Draft Sequence of the Neanderthal Genome,” Science, vol. 328 (2010)
P. Mellars and J.C. French, “Tenfold Population Increase in Western Europe at the Neandertal-to-Modern Human Transition,” Science, vol. 333 (2011)