Where does Dromedary (one-humped camel) come from?
The dromedary, the one-humped camel, was first tamed in the south and south-east of the Arabian Peninsula. Its wild ancestors have long since died out, so today it lives only as a domestic or feral animal, across Africa, Asia and even Australia.
Tamed in Arabia
Wild dromedaries once lived on the Arabian Peninsula, and a dromedary jawbone dated to 8,200 BC has been found on Saudi Arabia's Red Sea coast. A 2016 study compared ancient DNA from wild and early domestic camels with samples from 1,083 living ones. It found wild dromedaries from the south-east of the peninsula among the founders of the domestic herds. After the first taming, animals from wild populations that are now extinct kept joining the herds, a pattern the researchers call 'restocking from the wild'.
A body built for the desert
The famous hump stores fat, not water: it is fat bound together by fibrous tissue, which the camel breaks down for energy when food is scarce, so a hungry camel's hump leans over and droops. Water is saved in other ways. A dromedary can close its nostrils, its body temperature swings between 31 and 41.7 °C during the day so that it sweats less, and it can survive losing more than 30% of its body water. Afterwards it can drink more than 100 litres at one go.
Why people think of the Sahara
Camels are the very picture of the Sahara, and Africa now holds more than 80% of the world's dromedaries. But the dromedary was first tamed in Arabia. Archaeology and rock art show dromedaries in North Africa by 1500 BC at the latest, yet they were not widely used there until the Sahara grew drier. The first written record of them in North Africa comes from Julius Caesar's campaigns of 46 BC. After the Islamic conquest of North Africa, camels were imported in great numbers, and trade across the Sahara grew.
Sources: en.wikipedia.org ↗ · ilri.org ↗ · nottingham.ac.uk ↗ · animals.sandiegozoo.org ↗