A camel is an even-toed ungulate in the genus "Camelus" that bears distinctive fatty deposits known as "humps" on its back. Camels have long been domesticated and, as livestock, they provide food (milk and meat) and textiles (fiber and felt from hair).

A camel may spit because they are anticipating an unpleasant experience that they do not understand. They aren’t actually spitting, though—it’s more like throwing up! They bring up the contents of their stomach, along with saliva, and project it out. This is meant to surprise, distract, or bother whatever the camel feels is threatening it. You can tell if a camel is about to spit: its cheeks fill up and bulge.

More Info: animals.sandiegozoo.org