Ships of the desert, they carry a lifeline of trade and commerce in the caravans crossing the sands from city to city.
Subtypes include the war camel (trained to not fear battle and to attack), desert camels (very high endurance), mountain camels, and racing camels (aggressive and temperamental, but quite fast).
d20 System Rules
Camel, Common/Desert - SRD/3.5e Monster Manual p.195
Mountain - by Sevarian
Refs: SRD/3.5e MM/195