A Portuguese researcher has contributed to a landmark international investigation demonstrating that hominids controlled fire nearly 1.8 million years ago—pushing the known history of human fire use back by roughly 800,000 years. The finding, anchored in a South African cave, challenges longstanding assumptions about when our ancestors began to reshape their environment and diet.
Why This Matters
• Earliest cooking evidence: Direct proof that Homo erectus likely cooked food 1.8 M years ago, far earlier than the previous benchmark of 1 M years.
• Portugal connection: Filipe Natálio of the Universidade Nova de Lisboa's Applied Molecular Biosciences Unit co-authored the study published in PLOS ONE this month.
• Methodological breakthrough: A non-invasive luminescence technique now distinguishes genuinely burned bone from mineral-stained fossils, opening new avenues for deep-time archaeology.
• Human evolution pivot: Controlling fire supplied heat, protection, extended daylight hours, and ultimately transformed nutrition—key drivers of brain growth and social organization.
Burned Owl Pellets Tell the Story
Inside Wonderwerk Cave in South Africa's Northern Cape Province, researchers analyzed micromammal bones embedded in fossilized regurgitated pellets—droppings left by owls and other raptors over nearly 2 M years. The cave floor served as a continuous avian roost, layering pellet upon pellet in sediment that geologists can now date with precision.
The critical clue lay approximately 30 meters from the present-day entrance, far too deep for wildfire embers or spontaneous combustion to reach. That location indicates deliberate transport: hominids gathered fire from natural blazes outside, carried smoldering branches or coals inward, and fed the flames with whatever combustible material was at hand—including the abundant, dry owl pellets.
"The floor of the cave was covered almost continuously by these regurgitated balls for nearly 2 M years," the Universidade Nova noted in its announcement. Those pellets, rich in small bones and organic matter, became fuel, allowing Homo erectus to sustain firelight and heat in the shelter's interior.
How Luminescence Cracks the Code
Identifying fire traces across such vast timescales is a "colossal methodological challenge," the research consortium acknowledged. Traditional archaeology relies on visible charring, cracked surfaces, or color changes—signals that degrade or vanish after a million years of fossilization. Chemical processes such as fluoridation or manganese deposition can mimic the dark staining fire leaves on bone, fooling even experienced eyes.
The team, led by Spain's Museo Nacional de Ciencias Naturales (MNCN-CSIC) and Canada's University of Toronto, adapted a forensic technique based on how bone crystal structure changes under heat. When researchers illuminate thermally altered bone with specific wavelengths of light, it emits a characteristic red glow—a luminescent signature absent in unburned specimens. Complementary Fourier-transform infrared spectroscopy (FTIR) confirmed the chemical markers of combustion, ensuring the glow was not an artifact.
This dual-validation approach let the scientists confidently sort burned micromammal fossils from those merely stained by millions of years underground. The result: clear evidence of fire use in sediment layers dated between 1.07 M and 1.79 M years ago, with the deepest and most probable range clustering around 1.7 M to 1.8 M years.
What This Means for Residents and the Broader Public
For those following Portugal's science output, Filipe Natálio's involvement underscores the Universidade Nova de Lisboa's growing role in high-impact, multidisciplinary research. The institution emphasized that the finding "marks a turning point" and raises "fascinating questions" about the origins of food preparation as we know it.
"We have the first evidence of fire use by the genus Homo—perhaps Homo erectus—to cook," Natálio explained. "The impact takes us to a simple question: when did we learn to cook? Maybe from our parents. And them? The act of cooking food is now something with about 1.8 M years of history."
That long culinary timeline has profound implications for understanding human brain evolution. Cooked food is softer, more digestible, and releases significantly more calories and bioavailable nutrients than raw ingredients. Freed from spending half their waking hours chewing fibrous plants and tough meat—as modern chimpanzees do—early Homo could redirect time and metabolic energy toward social interaction, toolmaking, exploration, and brain development.
The "Opportunistic Pyrotechnology" Model
Because Homo erectus almost certainly lacked the ability to generate fire on demand—friction-based fire-starting appears much later in the archaeological record—the Wonderwerk evidence points to opportunistic capture. Hominids would have monitored the landscape for lightning strikes or dry-season wildfires, then seized burning branches or embers and transported them to the cave.
Maintaining that flame required constant attention: feeding it with fuel, shielding it from wind and rain, and possibly assigning group members to tend the hearth in shifts. Such behavior demands planning, memory, and cooperative social structures—cognitive capacities that may have been sharpened by the very act of fire management.
The hearth also became a social anchor. Sitting around firelight after dark extended productive hours for toolmaking, hide processing, storytelling, and knowledge transfer. Researchers believe these evening gatherings may have accelerated language development and reinforced pair bonds, contributing to more complex family and group organization.
Broader Context: Cooking and Cognition
Recent discoveries elsewhere support the idea that controlled fire and cooking were pivotal to human evolution. At Gesher Benot Ya'aqov in Israel, archaeologists found carp-like fish remains showing heat exposure dating to roughly 780,000 years ago. Meanwhile, charred plant remains and elaborate meal residues in European Paleolithic sites reveal that hunter-gatherer-fishers combined fish, berries, grasses, legumes, and even toxic nuts requiring detoxification—evidence of culinary sophistication stretching back tens of thousands of years.
A Neanderthal "recipe" roughly 70,000 years old included legumes, nuts, seeds, and bitter leaves, demonstrating that seasoning and multi-step preparation predate modern Homo sapiens. Molecular and microbial analyses of pottery shards confirm that Neolithic communities were baking fermented bread, brewing beverages, and preparing porridges from barley, wheat, and wild quinoa as early as 8,600 years ago.
Taken together, these findings dismantle the outdated "meat-hunter" stereotype and reveal our ancestors as "broad-spectrum eaters" who combined animal protein with an astonishing variety of plants, processed through grinding, roasting, boiling, and fermenting.
Anatomical Echoes of Fire
The Wonderwerk study dovetails with anatomical changes visible in the Homo erectus fossil record. Between 1.8 M and 1.9 M years ago, jaw size and tooth dimensions began to shrink—shifts consistent with a diet requiring less chewing force. Gut volume also decreased, because cooked food pre-digests in the flames, reducing the need for a large, energy-hungry digestive tract.
Those metabolic savings, in turn, fueled the expansion of the brain, which consumes roughly 20% of the body's resting energy in modern humans despite accounting for only 2% of body mass. Without the caloric windfall that cooking provided, such an expensive organ would have been a liability rather than an evolutionary advantage.
Implications for Portugal's Research Profile
Portugal's academic institutions have steadily raised their international profile in fields ranging from marine biology to astrophysics. Natálio's co-authorship on a study published in a high-impact open-access journal—and widely covered by global science media—reflects the Faculdade de Ciências e Tecnologia's investment in interdisciplinary collaboration and advanced analytical techniques.
The luminescence method developed for Wonderwerk may now be applied to other contested sites across Africa, Europe, and Asia, potentially rewriting the chronology of fire use on multiple continents. For Portuguese researchers and their funders, this represents both validation of past investment and a roadmap for future work at the intersection of chemistry, paleontology, and anthropology.
Questions Still Burning
While the evidence for 1.8-M-year-old fire use at Wonderwerk is robust, several questions remain open. Did Homo erectus groups across Africa and Eurasia adopt fire simultaneously, or did the practice diffuse gradually from a single innovator population? How long could early hominids keep a flame alive before losing it and waiting for the next natural ignition event?
And perhaps most intriguingly: if cooking began nearly 2 M years ago, when did hominids transition from scavenging fire to making it? Current data suggest reliable fire-starting techniques emerged only within the past few hundred thousand years, implying a vast interim during which our ancestors lived in a state of "fire dependency"—tethered to hearths they could feed but not birth.
Answering those questions will require more sites, more fossils, and continued refinement of analytical tools like the luminescence protocol that made Wonderwerk's secrets legible. For now, the cave's burned owl pellets stand as the oldest unambiguous cookbook in the human story—a 1.8-M-year-old record of warmth, safety, and the first tentative steps toward cuisine.
