Cut marks on 1.6 million-year-old bones reveal early humans moved prized meat – Phys.org

Analysis of bone fragments dating back 1.6 million years has provided new evidence that early humans engaged in the strategic transport of high-value meat. The discovery, centered on the identification of specific cut marks, indicates that early hominids did not merely scavenge or consume prey on-site but instead moved prized portions of meat to different locations.

This behavior suggests a level of planning and social organization previously underestimated for this period. By selecting the most calorie-dense parts of a carcass and transporting them, early humans demonstrated a primitive logistical system for food procurement and distribution.

The Evidence of Meat Transport

The findings are based on the examination of fossilized bones that exhibit clear cut marks, which are incisions made by stone tools during the butchering process. Researchers observed that these marks were concentrated on the bones associated with the most nutrient-rich muscle groups, often referred to as prized meat.

The spatial distribution of these bones suggests that the animals were not processed where they died. Instead, the presence of these specific high-value cuts at separate sites indicates that early humans were intentionally carrying the meat away from the kill site to a home base or a safer consumption area.

This pattern contradicts the simpler model of opportunistic scavenging, where early humans would have competed with other predators to eat whatever was available immediately. The evidence points toward a more calculated approach to foraging.

A Primitive Takeout System

The methodology of early human foraging has been described as a primitive takeout system. In this model, the primary butchery occurred at the source, but the most valuable resources were harvested and transported for later use or for sharing with a social group.

This transition from immediate consumption to transport implies several cognitive and social developments:

• Forward Planning: The ability to anticipate future needs and the value of transporting resources.
• Social Cooperation: The likelihood that meat was transported to be shared among a group, reinforcing social bonds and survival rates.
• Tool Specialization: The use of stone tools to efficiently remove high-calorie sections of meat from the bone.

Analytical Technology and Taphonomy

The identification of these behaviors relies on taphonomy, the scientific study of how organisms decay and become fossilized. To distinguish between human-made cut marks and marks left by carnivore teeth, researchers utilize high-resolution microscopic analysis.

Stone tool incisions typically leave a distinct V-shaped profile and internal micro-striations that differ significantly from the U-shaped grooves or crushed bone patterns caused by the teeth of predators. By mapping these marks across the skeletal remains, scientists can determine exactly which parts of the animal were targeted and the sequence in which the butchery occurred.

This forensic approach allows researchers to reconstruct the behavior of hominids from 1.6 million years ago with high precision, moving beyond speculation to evidence-based reconstructions of early human survival strategies.

Evolutionary Implications

The ability to secure and transport high-protein, high-calorie meat is closely linked to the evolution of the human brain. The transition to a diet rich in animal fats and proteins is widely considered a catalyst for the increase in brain size and complexity observed in the genus Homo.

By establishing a system for transporting prized meat, early humans reduced the risks associated with staying at a kill site, where they would have been vulnerable to larger predators. This shift in foraging behavior likely increased the overall stability of the food supply, supporting the metabolic demands of a growing brain.

the act of transporting food to a central location suggests the early stages of a home-base culture, where food sharing and social interaction became central to the species’ evolutionary success.