Camels have a series of physiological adaptations that allow them to withstand long periods of time without any external source of water.[19]  The dromedary camel can drink as seldom as once every 10 days even under very hot conditions, and can lose up to 30% of its body mass due to dehydration.[23] Unlike other mammals, camels' red blood cells are oval rather than circular in shape. This facilitates the flow of red blood cells during dehydration[24] and makes them better at withstanding high osmotic variation without rupturing when drinking large amounts of water: a 600kg (1,300lb) camel can drink 200L (53USgal) of water in three minutes.[25][26]