Enormous engraved rock art of anacondas, rodents and other animals along the Orinoco River in Colombia and Venezuela may have been used to mark territory 2,000 years ago
Map: What world s largest rock engravings may mean biztoc.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from biztoc.com Daily Mail and Mail on Sunday newspapers.