The Berbers and Nomads are very impressive in their knowledge of the desert and their ability to traverse the ever changing Saharan dunes on foot, by camel or behind the wheel of a 4X4. Camels or dromedaries (one hump) have been in the desert since around 200AD , the four wheel drives are much more recent !!! But both have a role and tourists use both modes of transport every day. The camel can go without water for up to 15 days depending on the temperature. The 4X4 is much thirstier as we know and more costly to run!!!