Comparative anatomy of the Bactrian and Dromedary Camels, and the human.
Humans domesticated Bactrian camels (Camelus ferus) over 4500 years ago, and Dromedary camels (Camelus dromedarius) even earlier - around 4000 BCE, or 6000 years ago. Domesticated Dromedary camels are so ancient that even the first dynasties of Egypt were thought to use them, from archaeological remains.
While Dromedary camels have survived relatively unchanged in the wild, Bactrian camels have been significantly altered by domestication. They’re shorter, far more amenable to human interaction, and have been bred to have longer fur and greater milk output. There is over a 3% difference in the genetic code between domestic and wild Bactrian camels - more than exists between humans and chimpanzees.
Comparative anatomy as applied to the purposes of the artist. Benjamin Waterhouse Hawkins, 1883.