BARCELONA, SPAIN—Neanderthals may have survived in parts of Spain for 3,000 years longer than they did in the rest of Western Europe, according to a Newsweek report. An international team of researchers working at three newly discovered Neanderthal sites in southern Iberia recovered stone tools thought to have been used about 37,000 years ago. João Zilhão of the University of Barcelona said Neanderthals are thought to have gone extinct in northern Spain and southern France between 40,000 and 42,000 years ago. He suggests the Ebro River acted as an effective barrier to the migration of modern humans into the region. For more on Neanderthals in Spain, go to “Neanderthal Medicine Chest.”