The Northern Daily Leader
Researchers have discovered life-sized rock carvings of camels, gazelles and other animals in the Saudi Arabian desert.
The carvings date back around 12,000 years and many are more than six feet (1.8 metres) tall. Scientists say they were created using a wedge-shaped rock to create sharp lines.
Several were etched on narrow ledges so the artists could not even step back to survey the final product as they were working.
"To engrave that much detail with just a rock takes real skill," said Maria Guagnin, an archaeologist with the Max Planck Institute of Geoanthropology in Germany who was involved in the discovery.
The animal carvings and engraving tools found at the site show people were living in the area about 2000 years earlier than scientists thought. It isn't clear how they survived