Camels are almost entirely domesticated, providing milk, meat and transport. There are two living species: the single-humped dromedary and the double-humped bactrian. The humps are not full of water as commonly believed, they are in fact made up of fatty deposits that still help with water storage, so camels can survive life in extremely hot and arid deserts. Being able to withstand long periods without water, and some extreme changes in body temperature, allows camels to survive in conditions that would be lethal to most other animals.

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