Homo naledi's small brain and mosaic anatomy

March 03, 2026

EgyptBioarchaeology

Cave

Source: We Found a Human Species That Shouldn’t Exist by Michael Button

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Homo naledi had a brain less than half the size of modern humans, with a volume of 465-610 cm³—above typical chimpanzee range (350-400 cm³) but well below modern humans (~1400 cm³). Yet their hands had precision grip capability, feet built for upright walking, and fingers long and curved for climbing. A striking mosaic of primitive and advanced anatomical traits. 🧠

Key facts

Homo naledi had a brain volume of 465-610 cm³, less than half a modern human brain
The brain size is firmly within the range of chimpanzees
Despite small brain, hands show long thumbs, strong muscles, and precision grip capability
Feet are surprisingly modern, built for upright walking and long-distance bipedal travel
Shoulders are primitive, positioned higher for climbing
Fingers are long and curved, suggesting lifelong climbing behavior
The species represents a mosaic of primitive and advanced traits
Brain shape shows frontal regions similar to other Homo species associated with planning and social behavior