Despite popular belief, a camel's hump stores not water, but fat - about 80 pounds of it. With this energy supply on its back, camel can go several days without eating. As it goes through the fat store, the hump shrinks and gets flabby. It gets firm again after the animal refuels.
I cannot ride a horse to save my life, but, like my protagonist, archaeologist Grace Madison, I adore riding camels. Their smooth gaits and crabby dispositions suit me well, and I never miss a camel ride while visiting digs in the Middle East. http://www.amazon.com/When-Camels-Fly-Parched-Book-ebook/dp/B00K7CAEHK/ref=pd_sim_sbs_kstore_1?ie=UTF8&refRID=05MDRHZGJXZ5487MBENH