DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Giraffe petroglyph. Saharan engraving on a sandstone boulder depicting a human figure and a herd of giraffes. It is accompanied by a Tuareg tifinagh script (right), which has been carved more recently. Photographed in Tadrart, Tassili National Park, Algeria.
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