Two and a half million years ago, a stocky hominid wandered the drying grasslands of East Africa. Standing about five feet tall, this creature possessed a skull unlike almost any other in our evolutionary family tree. A prominent bony ridge ran along the top of its head, anchoring massive jaw muscles that could crush with immense force. For decades, this intimidating anatomy led scientists to a dark conclusion. They saw a monster.
In the middle of the twentieth century, anthropologists Raymond Dart and Robert Ardrey popularised a chilling portrait of our ancient relatives. In their view, these early hominids were violent, aggressive killers who conquered the wild through savage combat. The evidence seemed written in stone. Archaeological caves containing the remains of Australopithecus robustus were littered with the fractured bones of prehistoric beasts. It seemed obvious to researchers of the era that these heavy-browed creatures had slaughtered everything in their path.
That bloody myth eventually crumbled under the lens of modern microscopic analysis. When scientists began examining the fossilised teeth of Australopithecus robustus, they found no evidence of bone-cracking or consistent meat-eating. Instead, the microscopic wear patterns on their teeth revealed a remarkably peaceful truth. These hominids were dedicated vegetarians.
The massive skull of Australopithecus robustus was actually a highly specialised plant-processing factory. That distinctive crest at the top of the skull, known as the sagittal crest, held the enormous muscles required to power a spectacular grinding apparatus. At the back of the jaw sat giant cheek teeth, rounded and covered in thick enamel like ancient millstones. Meanwhile, the front of the mouth featured tiny, peg-like incisors and canines, useless for tearing flesh but perfectly suited for a creature that did not need to bite into prey. This jaw was designed for pulverising roots, hard seeds, grains, nuts, and tough bark.
The piles of animal bones found alongside their fossils did not belong to hominid prey. Modern taphonomy, the study of how organisms decay and fossilise, solved the riddle. The bones in those limestone caves were the debris left behind by genuine carnivores like sabre-tooth tigers and leopards. Hundreds of Australopithecus robustus skulls discovered at the Swartkrans site in South Africa bear the distinct puncture wounds of predator fangs. The supposed hunters were actually the hunted, falling victim to the true predators of the ancient savannah.
Further archaeological discoveries have reinforced this gentler portrait. When researchers unearthed fossilised hands belonging to Australopithecus robustus, they discovered surprising dexterity and flexibility. Alongside these hands lay broken animal bones, but they were not weapons of war. Instead, microscopic wear showed they were used as digging sticks, perfect for unearthing nutritious roots and tubers buried deep in the soil.
While this highly focused vegetarian diet sustained the species for over a million years, it ultimately sealed their fate. As the climate grew increasingly arid and the vegetation shifted, their specialised chewing machinery left them with little room to adapt. They could not easily pivot to new food sources when their preferred plants vanished. While more versatile, tool-using species survived to become the ancestors of modern humans, the peaceful munching machines of the savannah quietly faded into extinction, leaving behind only their incredible teeth to tell their true story.
Bibliographic Information
- Title: Vegetarianism: A History
- Subtitle: A History
- Author: Colin Spencer
- Publisher: Four Walls Eight Windows (New York/London)
- Publication Year: 2002 (First Four Walls Eight Windows printing; originally published as The Heretic’s Feast by Fourth Estate, London, 1993; revised and published as Vegetarianism by Grub Street, London, 2000)
- Edition: Second Edition (Revised and updated)
- ISBN: 1-56858-238-2 (hc.)
- Historical Period Covered: Prehistory (Miocene epoch, 24 million years ago) to the early 21st century (circa 2002)
- Main Subject Areas: History of Vegetarianism, Evolutionary Anthropology, Classical Philosophy, Comparative Religion, Christian Heresy and Sectarianism, History of Science and Medicine, Social Reform Movements, Environmental and Animal Rights History
(Chapter 1)