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New archaeological evidence shows that humans already lived in tropical forests much earlier than expected, reorganizing part of the understanding of human evolution
A archaeological discovery in the Ivory Coast is leading scientists to revise part of what was known about human evolution. Evidence identified in a tropical forest indicates that human groups occupied this environment approximately 150,000 years ago, about 80,000 years before the oldest known record for this type of ecosystem. The research, published in 2025 in the scientific journal Nature, shows that human presence in densely forested areas may be much older than previously thought. This finding broadens the understanding of early human adaptation and repositions tropical forests within the history of human occupation.
Technical discovery reveals very ancient human occupation
The discovery contradicts a traditional interpretation of the environments occupied by early human groups. For a long time, researchers associated early human survival mainly with open areas, such as savannas and coastal regions, considered more favorable for food search and movement. The new research, however, suggests that these groups were already able to live in dense tropical forests much earlier than indicated by previous records. This data shows that human adaptation may have been broader and more complex since early stages of evolution.
Stone tools help to prove human presence
The confirmation of the antiquity of the occupation occurred through the analysis of stone tools found in deep soil layers. Researchers applied dating methods such as Optically Stimulated Luminescence and Electron Spin Resonance, techniques used to estimate the age of sediments and archaeological remains. Studies of fossilized pollen and phytoliths also helped reconstruct the vegetation present in the region at that time. The results indicated that the environment was a tropical forest when human groups occupied the site.
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Environmental adaptation broadens understanding of Homo sapiens
The results suggest that human ancestors had a greater capacity for environmental adaptation than previously recognized. Presence in a tropical forest demonstrates that these groups did not rely solely on open areas to survive. This behavior indicates flexibility in dense, humid, and more complex ecosystems. For researchers, this ability may have contributed to the expansion and evolutionary success of Homo sapiens over time.
Tropical regions may hold new evidence
The discovery also reinforces the possibility that other important evidence is preserved in little-explored tropical regions. Many forest areas have received less archaeological attention than savannas and coastal zones. Therefore, future excavations may reveal even older occupations and add new information about the relationship between humans and forest ecosystems. This scenario shows that the history of human presence in tropical forests may still undergo new revisions.
The discovery in a broader context
The study published by Nature broadens the debate on the early chapters of human history. Human presence in tropical forests around 150,000 years ago challenges the idea that these environments were occupied only in more recent phases. This change in perspective reorganizes how scientists view human adaptation in different landscapes. Thus, the Ivory Coast takes on a relevant role in research on evolution, migration, and survival in forest environments.
The future of research on human evolution
Researchers assess that new excavations in tropical areas may reveal even older and more detailed records. Investigating these regions can help fill gaps about how early humans explored forests, found resources, and adapted to challenging landscapes. Meanwhile, the discovery reinforces that human evolution was marked by a constant capacity for adaptation.
How many other pieces of evidence about the origin and expansion of Homo sapiens may still be hidden in tropical forests?
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