The Tibesti Mountains are renowned for their rock and parietal art. Around 200 engraving sites—including some 1800 different representations—and 100 painting sites have been identified. Most date from between the 5th and 3rd millennia BC, although some date from the 6th millennium BC, centuries before the arrival of the Toubou. The art has suffered the effects of time, including weathering from sand blown by the wind. The earliest works often portray animals that have since died out due to climate change in the Tibesti, including elephants, rhinoceros, hippopotamus and giraffes. More recent art includes ostriches and antelopes, which have an exceptional presence on the edge of the range, as well as gazelles and sheep, which are more common.