Petroglyphs on sandstone at a national park in Chad bear witness to wildlife that once roamed the area before the continent’s water largely receded 6,000 years ago. Could it return? The Ennedi Natural ...

Report on rock paintings in the Ennedi Mountains of northern Chad. https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full ...