Clovis mammoth bones cannot prove hunters rather than scavengers

A new study suggests that stone points found among mammoth bones throughout Ice Age North America cannot establish whether the Clovis people who left them were hunters or scavengers.

The archaeological traces left by a carcass butchered after a hunt and one processed after being discovered dead are virtually indistinguishable.

The difference matters greatly. For decades, these bone deposits have been classified as kill sites, supporting the idea that Clovis hunters contributed to the extinction of mammoths, mastodons and related animals.

Without certainty that people killed the animals, however, that argument no longer has a secure basis.

Clues that look identical

The issue rests on what archaeologists call equifinality – when very different events in the past produce the same surviving evidence.

A pile of mammoth bones bearing stone-tool marks confirms that people used the carcass. It cannot establish whether they killed the animal or encountered it after it had died.

Either scenario produces butchered bones alongside discarded points in the soil.

These fluted stone points were used by some of the continent’s earliest known inhabitants, yet it remains uncertain whether they hunted large game.

Were Clovis people hunters or scavengers

Across North America, 15 well-documented locations contain Clovis points among the remains of mammoths, mastodons and their relatives – the large-tusked animals scientists classify as proboscideans.

Metin I. Eren, an archaeologist at Kent State University, and four colleagues examined what these 15 sites truly document. Their paper reviews decades of evidence to challenge an assumption that most archaeologists had accepted.

They do not conclude that Clovis people never hunted. Rather, they argue that the physical record cannot differentiate between the two behaviours. Bones cannot reveal how many of the 15 sites represent kills and how many reflect scavenged carcasses.

The case for scavenging

Scavenging is among nature’s most commonplace behaviours. Almost every carnivore will take an effortless meal, while lions and hyenas regularly steal carcasses from one another.

Humans are no different. Archaeological and historical records contain many examples of people eating animals found dead. Even modern hunting societies scavenge whenever the opportunity arises.

David J. Meltzer, an archaeologist at Southern Methodist University (SMU) and a co-author, says it would be unusual if Clovis foragers were the sole exception.

“While Clovis foragers likely hunted mammoths, it would be odd indeed if Clovis foragers … did not scavenge,” said Meltzer.

This interpretation also aligned with the team’s earlier research into the weapons. Their experiments indicated that the broad, thick stone points would frequently fail to reach a mammoth’s vital organs. That could make a swift kill difficult and a carcass found dead especially valuable.

Evidence from the Anzick child

A recent finding had appeared to resolve the question in favour of Clovis people as hunters.

In 2024, researchers examined the bones of the Anzick child, an 18-month-old boy buried with Clovis tools in Montana roughly 12,800 years ago.

He is the only known Clovis individual whose remains retain a chemical dietary record. The composition of his bones reflects what his mother consumed while breastfeeding him.

That study calculated that mammoth accounted for about 40 percent of her diet. Researchers regarded this as strong evidence for Clovis people being committed big-game hunters.

Rethinking high nitrogen levels

The new paper offers a different reading of the same chemical evidence. Elevated nitrogen levels in bone may indicate consumption of meat from high in the food chain, as the earlier researchers proposed.

But identical levels may also result from eating insects that feed on a decomposing carcass.

Meltzer suggested that the high values could equally reflect a mother “eating maggots and not mammoth meat,”.

The overkill case weakens

The findings affect one of the most enduring debates in American archaeology.

The overkill hypothesis proposes that human hunters entered a landscape filled with animals unafraid of people and eradicated mammoths along with dozens of other large species within a few thousand years.

This argument depends on Clovis sites being confirmed kill locations. If the bones can be explained as readily by scavenging as by hunting, the number of certain kills falls.

One study simulating where people and animals may have overlapped concluded that some associations could result purely by chance.

The authors stress that Clovis people almost certainly did hunt mammoths on occasion. What they dispute is the leap from a small number of uncertain sites to slaughter across an entire continent.

“Despite some archaeologists’ and other scientists’ long-standing beliefs, there is just no definitive scientific evidence for a human role in the North American Late Pleistocene extinction of proboscideans,” said Eren.

Focus returns to climate change

The study’s conclusion is more limited, but more robust, than the earlier account. Bones and points at the 15 sites cannot alone demonstrate that anyone killed a mammoth, so they cannot support a case for human-caused extinction either.

This places greater emphasis on climate. The disruption at the end of the last Ice Age, when warming and drying transformed the grasslands on which these animals relied, becomes the more likely explanation.

For archaeologists, the result raises the evidential threshold: an association between bones and tools should be treated as the first question, not a final judgement.