The Camel
Camels have a series of physiological adaptations that allow them to withstand long periods of time without any external source of water. Unlike other mammals, their red blood cells are oval rather than circular in shape. This facilitates the flow of red blood cells during dehydration 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 of water in three minutes.
Camels are able to withstand changes in body temperature and water consumption that would kill most other animals. Their temperature ranges from 34°C (93°F) at dawn and steadily increases to 40°C (104°F) by sunset, before they cool off at night again. Camels rarely sweat, even when ambient temperatures reach 49°C (120°F). Any sweat that does occur evaporates at the skin level rather than at the surface of their coat; the heat of vaporization therefore comes from body heat rather than ambient heat.
From Wikipedia
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