Neanderthals Resorted to Cannibalism in the Face of Climate Change

Neanderthals Resorted to Cannibalism in the Face of Climate Change
We know that Neanderthals were carnivores, with a diet that consisted primarily—if not exclusively—of meat. But a new study by researchers in France suggests that around 120,000 years ago, when a period of sudden climate change wiped out many of the animals who made up their food supply, some Neanderthals resorted to cannibalism.

In the 1990s, the remains of six Neanderthals were found in Baume Moula-Guercy, a small cave in the Rhône valley in southern France. The remains, which belonged to two adults, two adolescents and two children, showed many of the tell-tale signs of cannibalism: according to Cosmos, the bodies had been completely dismembered, and the bones showed both cut marks left by stone tools and bite marks resembling ones left by Neanderthal, rather than animal, teeth.

Evidence of suspected Neanderthal cannibalism is not new. In addition to the remains found at Moula-Guercy, researchers have also uncovered bones bearing the signature marks of cannibalism at sites in Belgium, Spain and Croatia (though the Croatian remains were later shown to have been damaged by natural processes).

In 2016, researchers presented the Belgian bones, found in a cave near the town of Goyet, as “unambiguous evidence" that Neanderthals practiced cannibalism. But they were unable to identify what drove these ancient human relatives to eat their own. Was it simply a case of needing nourishment to survive? Or was cannibalism part of a cultural or religious ritual?

The new study, published in the Journal of Archaeological Science, suggests one explanation. The Neanderthal remains in the cave at Moula-Guercy were discovered in the layer of sediment dated to the last interglacial period, which lasted from around 128,000 to 114,000 years ago. During that time, temperatures  jumped several degrees higher from the era that occurred directly before the interglacial period, as well as from the period that came directly after it.

When researchers examined the animal remains found in the layers of cave floor, they noticed the sudden change in climate had caused a dramatic shifting in food sources. Before the interglacial period, remains of larger mammals such as bison, reindeer and woolly mammoths, along with smaller ones like lemmings and mice, were found. But after the temperature warmed, they saw no evidence of large mammals, with snakes, tortoises, and rodents discovered instead.

Scientists have long debated how meat-centric the Neanderthal diet actually was, and some evidence supports the idea that they consumed plants as well. But one recent study based on nitrogen isotope ratios, a measure scientists use to track the position of an organism in the food chain, found that Neanderthals mainly consumed meat, usually in the form of large herbivorous mammals.

The findings at Moula-Guercy suggest that as the climate warmed, and open grasslands turned into temperate forests, Neanderthals would have found fewer of these animals to hunt. As their food supply dwindled, apparently, some of them took drastic steps to assuage their hunger. Continue...

James Koroma

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