
SPAIN: In 1994, the jumbled remains of several Neanderthals were found in a cave called El Sidrón. Scientists recently determined there were 12 individuals—six adults and six children—and that they were massacred together and cannibalized. The gruesome scene is also providing some of the first detailed evidence of Neanderthal social structure. Mitochondrial DNA shows that they were a family—the three adult males were related, though the three females were not. This suggests that Neanderthals were patrilocal—females left their own families to join their mates.