Stunning DNA discovery is forcing scientists to rethink why Neanderthals disappeared

For years, Neanderthals have been cast as evolution’s cautionary tale. The popular story was that their numbers dwindled, communities became increasingly isolated and, eventually, repeated inbreeding left them too genetically weak to survive.

A major new study suggests that story may be wrong.

Researchers have analysed the DNA of 27 Neanderthals from Belgium and France, and instead of finding a species in genetic freefall, they found populations that were surprisingly healthy and connected right up until just a few thousand years before Neanderthals disappeared.

Scientists may have been looking in the wrong place

Part of the problem is where the evidence came from.

Until now, scientists had only four high-quality Neanderthal genomes to work with, and three belonged to individuals who lived in Siberia, at the extreme eastern edge of the Neanderthals’ range. Those groups really did appear isolated and showed signs of close inbreeding.

But judging every Neanderthal population by those individuals may have been a bit like trying to understand modern Europe by studying one tiny village in the Arctic.

The new genomes come from Western Europe, much closer to what was once the heartland of Neanderthal life. They paint a very different picture.

A healthier population than expected

The researchers found little evidence that these late Neanderthals were repeatedly mating with close relatives. They also failed to find signs that harmful genetic mutations had steadily built up over time, something that would be expected if inbreeding had been driving the species towards extinction.

Instead, the DNA suggests these communities remained connected across surprisingly large areas. Chemical clues preserved in the bones point in the same direction, indicating that some individuals had travelled from different regions rather than spending their entire lives in one place.

There was another surprise, too. Although modern humans had already reached Europe by this point, none of the newly sequenced Neanderthals showed evidence of recent modern human ancestry. That doesn’t mean the two groups never had children together – people alive today outside Africa still carry small amounts of Neanderthal DNA – but it suggests those encounters either happened elsewhere or that any mixed descendants became part of modern human communities instead.

The Neanderthal mystery just got bigger

If Neanderthals weren’t slowly being undone by bad genetics, what happened?

Scientists still don’t have a definitive answer.

Competition with expanding populations of modern humans remains a leading possibility. Rapid climate swings, shrinking habitats or a combination of several pressures could also have played a role.

In other words, this study doesn’t solve one of prehistory’s biggest mysteries. It simply removes one of the leading suspects.

More than 40,000 years after Neanderthals vanished, the case is still wide open - but the idea that they simply inbred themselves into extinction now looks much harder to defend.

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