European Neanderthals ate fresh seafood, which may have given their brains a boost

(CNN)Some Neanderthals really enjoyed their surf and turf rather than mammoth steaks, according to a new study. The recent excavation of a cave site along Portugal's coast revealed a wealth of fossilized remains of food, including fish, birds and mammals. It's estimated that Neanderthals lived in the cave, known as Figueira Brava, between 86,000 and 106,000 years ago. The discovery sheds light on Neanderthal populations who relied on the sea as a source of food, in addition to hunting and gathering on land -- a much different picture than those who were hunting mammoths in bitterly cold climates.

These Neanderthals enjoyed a diverse diet. From the sea, they could feast on limpet, mussels, clams, brown crabs, spider crabs, sharks, eels, sea breams, mullets, dolphins and seals. Marine birds also included mallards, common scoters (a large sea duck), geese, cormorants, gannets, shags, auks, egrets and loons. On land, they hunted red deer, goats, horses, tortoises and aurochs, an extinct wild ox.

They supplemented with plants like remnants of olive and fig trees as well as pine nuts taken from pine trees. Neanderthals living in Italy and across the Iberian Peninsula likely would have followed a similar lifestyle with a Mediterranean climate. The study published Thursday in the journal Science. In fact, the amount and diversity of marine fossils found in the cave exceeds other more recent sites.

This suggests that Neanderthals were comfortable and practiced at catching seafood. Previously, this level of adaptability was only associated with modern humans living in southern Africa at the same time. "Figueira Brava provides the first record of significant marine resource consumption among Europe's Neanderthals," the researchers wrote in the study. For researchers, it's another way of narrowing the gap between modern humans and Neanderthals.

Some researchers believe that the introduction of seafood into the diet of early modern humans helped their cognitive development because of Omega-3 fatty acids and other brain-boosting nutrients. That contributed to cultural and technological developments that led them to migrate out of Africa and spread across the globe. "If this common consumption of marine resources played an important role in the development of cognitive skills, it did so on the entire humanity, including Neanderthals, and not only the African population that spread later," said João Zilhão, study author and Catalan Institution for Research and Advanced Studies researcher at the University of Barcelona. In recent years, researchers have uncovered proof that "Neanderthals had a symbolic material culture," Zilhão said.