Early hominins may have relied on giant animals like elephants more than we thought, turning to them as a key food source nearly two million years ago.
While evidence of early humans processing large animals has been spotty in the oldest sites, a new study shows clear signs of elephant butchery starting around 1.8 million years ago. Researchers report December 21 in a preprint published in BioRxiv that a fresh site at Olduvai Gorge in Tanzania provides the earliest direct proof, marking a major shift in how hominins interacted with big game.
The idea that early hominins butchered megafauna, animals like elephants and hippos, has long sparked debate. Some see it as rare scavenging, a backup plan when easier food was scarce. Others argue it was a core strategy for survival. At Olduvai, signs of such activity are thin in the earlier Oldowan layers of Bed I, but they ramp up after 1.8 million years ago in Bed II, around the time Acheulean tools appear, though not tied directly to those handaxes or cleavers.
The new site, named Emiliano Aguirre Korongo or EAK, sits at the base of Bed II, right on Tuff IF, a volcanic layer dated to 1.78 million years. It holds parts of a young elephant’s skeleton — pelvis, hind legs, ribs, a flipped skull with tusks — alongside 80 stone tools, mostly sharp flakes. The bones and tools cluster tightly, suggesting hominins worked the carcass there.
To confirm the link, the team used spatial statistics. Bones pack densely in the center, with tools edging the periphery, as if discarded during processing. Two bones show green fractures, breaks on fresh bone from hammering, pointing to human action, likely to reach marrow or fat inside.
“Rather than opportunistic scavenging, these findings suggest a strategic adaptation to megafaunal resources, with implications for early human subsistence and social organization,” Manuel Domínguez-Rodrigo and colleagues write in the paper.
A wider survey across Olduvai’s landscape bolsters this. In Bed I, megafauna traces are rare. But from lower Bed II onward, elephant and hippo remains cluster in wetland and river zones, overlapping with dense tool scatters. Green-broken elephant bones appear only in these tool-rich areas, not randomly, hinting at targeted use.
At sites like EAK and later ones such as BK or TK, hominins left bigger, more complex camps — spanning hundreds of square meters with layered occupations. This contrasts with smaller Oldowan spots, suggesting larger groups or repeated visits, fueled by big kills.”The ability to systematically exploit large prey represents a unique evolutionary trajectory, with no direct modern analogue, since modern foragers do so only episodically,” Domínguez-Rodrigo says.
Fat may have been a draw. Elephant bones hold rich stores, including nutritious acids modern scavengers like hyenas can’t crack in adults. Yet questions linger: Were hominins hunting or scavenging? Evidence leans toward access soon after death, but direct proof of kills is absent.
The shift aligns with Homo erectus emerging, bulkier and likely meat-dependent. “This pattern likely signifies critical innovations in human evolution, coinciding with major anatomical and physiological transformations in early hominins,” Domínguez-Rodrigo says.
Though no cut marks appear on EAK’s bones, possibly due to weathering, the spatial ties and fractures make a strong case. It pushes back firm evidence of elephant butchery, reshaping views on early diets and societies.
Citations
M. Domínguez-Rodrigo et al. Earliest Evidence of Elephant Butchery at Olduvai Gorge (Tanzania) Reveals the Evolutionary Impact of Early Human Megafaunal Exploitation. bioRxiv. Published online December 16, 2025. DOI: 10.1101/2025.08.28.672811
