A decadent beef brisket or juicy ham might grace your table this holiday season — a far cry from our ancient ancestors’ first forays into carnivory. About two and a half million years ago, early humans started using sharp-edged tools to cut through animal carcasses they came across, gobbling up any nutritious meat and marrow they could scavenge.
For “Meet a SI-entist” we chatted with Briana Pobiner, a research scientist and educator in the Human Origins Program at the Smithsonian National Museum of Natural History who studies this early culinary evolution. Pobiner shares what it’s like researching the ancient past and what she enjoys most about working with other paleoanthropologists in the field.
How did you get interested in learning about humans of the very distant past?
My first semester in college I had a meeting with my academic advisor to find a fourth class to take. I had come into college thinking I probably wanted to be an English major — I wasn't really into science. She was a former anthropology professor, and she suggested I take anthropology. I said, “I don't even know what that is,” and she explained that anthropology is the study of people. I thought, “that sounds pretty cool.” So, I took an introduction to anthropology class, and then the next semester I signed up for a class on primate evolution and behavior. I had an amazing professor and loved the course. I then went to a paleoanthropology field school in South Africa, and I was hooked!
You study the evolution of the human diet. What kind of evidence or data do you use in your research?
The cool thing about ancient diets is there's a lot of different lines of evidence to study them. What I do is look at fossils of animal bones from archaeological sites, particularly animal bones that have evidence of human butchery. That's a kind of ‘smoking gun’ of evidence that humans were there: they butchered these animals and ate them.
How does your research intersect with the museum's collections?
Most of the research that I do is actually not on collections within the museum. The collections I'm studying are mostly in museums in Africa — also sometimes in Europe and Asia. But I also have on loan a collection of modern animals from Kenya that I collected and that were eaten by big predators. Early humans competed with big predators to eat animals, so I want to also learn what it looks like when big predators eat animals – and I can do that by studying modern animal bones. Then I can look for those predator’s chewing damage patterns on fossil bones, too.
When and why did humans start eating meat?
By about two and a half million years ago, early humans started to occasionally eat meat. By about 2 million years ago, this happened more regularly. By probably about a million and a half years ago, humans started to get the better parts of animals. They shifted from just scavenging the leftovers to maybe getting earlier access to carcasses.
The “why” questions are the impossible ones to answer about the past. Whether resources were changing on the landscape or if there were just more animals around for early humans to encounter — I don't know. The “how” is probably an answerable question, though. Early humans didn't have sharp fangs like predators do, so they couldn't physically bite into carcasses. It really was the invention of technology and stone tools [that made meat-eating possible] — like using rounded rocks to bash open bones to get at the marrow inside and sharp-edged rocks to slice meat off bones.