Nearly 5,000 cave painting were discovered in northeastern Mexico in 2006 . At least three nomadic hunter-gatherer groups -- the Guajolotes , Iconoplos and Pintos -- are believed to have made the 4,926 drawings . This week , archeologists revealed their initial findings . Score: 6 But they are believed to have been made by hunter-gatherer tribes .
Nearly 5,000 cave painting were discovered in northeastern Mexico in 2006 . This week , archeologists revealed their initial findings . Score: 6 But they are believed to have been made by hunter-gatherer tribes .