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A camel is an even-toed ungulate within the genus camelus. There are two species of camel: the dromedary, or Arabian camel - which has a single hump - and the Bactrian Camel which has two. Camels do not store water in their humps as is commonly believed. The humps are actually a reservoir of fatty tissue. The average life expectancy of a camel is 40 to 50 years. The kidneys and intestines of a camel are very efficient at retaining water. A camel’s urine resembles a thick syrup, and their faeces are so dry that they can be used as a fuel for fire.