Weird dental scratches in humans can indicate tool use, but in some macaques, they mean something entirely different
Teeth have a story to tell, and sometimes that story has a surprising twist. Researchers have long studied the arrangement and condition of teeth to determine an animal’s age, diet, health and even technological capabilities—including tool use in early human species. Now a study published in the American Journal of Biological Anthropology offers new insight into the diet and behavior of a world-famous macaque monkey troop.
“Teeth are the most resistant part of our skeleton,” says Almudena Estalrrich Albo a paleoanthropologist at the University of Cantabria in Spain, who was not involved in the study. Unlike other bones, which can heal, teeth do not remodel after being chipped or scratched. “Because of that, they collect information about an individual’s life,” Estalrrich Albo adds.
“This population has been studied since 1952,” says study co-author Andrew MacIntosh, a behavioral primatologist at the Center for International Collaboration and Advanced Studies in Primatology at Kyoto University in Japan. “Nobody has ever mentioned tool use.” If scientists “found these grooves on the back teeth and these large scratches on the front teeth in a fossil human sample, I genuinely think that most researchers would identify them as tool use,” Towle says.
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