Archaeologists are planning an expedition to the Sahara desert to study one of the most extraordinary prehistoric works of art yet discovered: a group of giraffes carved on rock. The archaeologists will be taking casts of the images, which were carved nine-thousand years ago on a slab of desert sandstone in a remote part of Niger.
     One of the giraffes depicted is more than six metres tall. It has been described by rock art experts as one of the greatest pieces of rock carving in the world. The exact location of the site, known only to local tribespeople and a handful of archaeologists, is being kept secret to avoid any chance of looting.

Source: BBC World Service