One-humped and two-humped camels are two entirely different species. The two-humped species is the Bactrian camel, while the one-humped species is the dromedary. Bactrian camels are an Asiatic species, named after Bactria in Central Asia, whereas dromedaries are a North African species.
Bactrian camels have woolly coats with manes and beards. In winter, their coats are long and thick, but as the seasons change, they shed their winter coats extremely rapidly, with the hair peeling off in chunks. Dromedaries, in contrast, have a smooth coat throughout the year. Dromedaries are slightly smaller on average than Bactrians, as well. Both species are similar in length, weight and height on average, but mature male dromedaries can weigh 2,200 pounds. Bactrian males rarely weigh more than 1,300 pounds, and females of both species are smaller.