For decades, paleoarchaeologists assumed Neanderthals were less intelligent than Homo sapiens—a narrative that helped explain their eventual extinction. But new evidence from Spain’s Los Aviones Cave is upending that view. A team of researchers has uncovered proof that Neanderthals not only consumed shellfish but did so with a sophisticated, seasonal strategy 115,000 years ago—long before modern humans adopted similar coastal foraging practices.

The discovery, published in Science in 2020, reveals that Neanderthals living near the Mediterranean coast were harvesting gastropods, limpets, and other mollusks as a key part of their diet. Unlike previous assumptions that they struggled to exploit marine resources, these findings show they were highly adaptive, selecting shellfish during winter months when nutritional quality peaked and risks like toxic algae were lower.

Why it matters: This challenges the idea that Neanderthals were purely inland hunters. Instead, they appear to have developed a fully modern subsistence strategy—one that may have contributed to their cognitive and reproductive success. The study also suggests that our own love of seafood could trace its roots to these ancient relatives.

Shellfish as a Seasonal Staple: How Neanderthals Outsmarted the Coast

The research, led by archaeologist Asier García-Escárzaga of Spain’s Universitat Autònoma de Barcelona (UAB), analyzed 115,000-year-old mollusk shells from Los Aviones Cave. Using oxygen isotopic analysis—a method that acts like a “prehistoric thermometer”—the team determined the shellfish were harvested primarily between November and April, when mollusks were fattest and safest to eat.

“They consumed marine resources throughout the year, but with a very clear preference for winter and autumn months,” García-Escárzaga explained in the Science study. This seasonal pattern mirrors modern coastal foraging practices in Europe, where shellfish are most nutritious and least risky during colder months.

The shells showed signs of human processing, including cut marks and percussion damage, confirming they were intentionally gathered as food. The discovery contradicts earlier theories that Neanderthals avoided coastal environments due to perceived cognitive limitations. Instead, it suggests they were highly skilled in exploiting marine ecosystems—long before Homo sapiens arrived in Europe.

Nutritional Boost: Omega-3s and Brain Development

Shellfish are rich in omega-3 fatty acids, zinc, and iodine—nutrients linked to brain development and reproductive health. The study proposes that this diet may have played a role in Neanderthal cognitive abilities, potentially explaining why they created cave art and other symbolic behaviors previously thought unique to modern humans.

“If this common consumption of marine resources played an key role in cognitive development, it did so across all humanity—including Neanderthals,” García-Escárzaga noted. The findings align with earlier research from Portugal’s Figueira Brava caves, where Neanderthals were found to eat fish and mollusks as early as 106,000 years ago.

Debunking the “Caveman” Myth: Neanderthals Were More Than Meat-Eaters

For years, Neanderthals were portrayed as brute hunters reliant on mammoth and rhino meat. But recent dental and isotopic studies reveal a diverse diet, including plants, nuts, and now—shellfish. The Los Aviones discovery adds to evidence that Neanderthals were opportunistic foragers, adapting their menus based on local availability.

“Their diet wasn’t a romanticized carnivore fantasy,” said García-Escárzaga. “They scavenged, hunted, and foraged—just like us.” The seasonal shellfish consumption strategy was particularly advanced, demonstrating an understanding of ecological cycles and food safety risks.

What Happens Next? The Search for More Coastal Neanderthal Sites

This study raises intriguing questions: Were Neanderthals along other coastlines—like the Mediterranean or Atlantic—also harvesting shellfish? And did this diet contribute to their survival in competition with Homo sapiens?

García-Escárzaga’s team is now expanding research to other coastal caves in Spain and France, searching for similar evidence. Meanwhile, genetic studies are exploring whether Neanderthal DNA—still present in modern humans—might be linked to our own preferences for seafood.

Key Takeaways

• Neanderthals ate shellfish 115,000 years ago—long before modern humans adopted coastal foraging.
• They harvested mollusks seasonally, prioritizing winter months for safety and nutrition.
• Shellfish provided omega-3s and zinc, possibly boosting brain development.
• The discovery challenges the idea that Neanderthals were less intelligent than Homo sapiens.
• Researchers are now searching for more coastal Neanderthal sites to test this theory further.

Reader Q&A

Q: Did Neanderthals cook their shellfish?

A: The study doesn’t confirm cooking, but the shells show signs of processing (cutting, cracking). Future excavations may reveal hearths or tools used for preparation.

Q: Could shellfish have helped Neanderthals survive longer?

A: Possibly. The nutrients in shellfish may have supported brain health and reproduction, giving them an advantage in harsh environments. However, climate change and competition with Homo sapiens ultimately contributed to their extinction.

Q: Are there other examples of Neanderthals eating seafood?

A: Yes. In Portugal’s Figueira Brava caves, Neanderthals ate fish and mollusks as early as 106,000 years ago. Similar findings have emerged from Italy and France.

What do you think? Could Neanderthals’ shellfish diet have shaped human evolution? Share your thoughts in the comments—and don’t forget to follow World Today Journal for more breaking science news.