Arabian camels, also known as dromedaries, have only one hump, but they employ it to great effect. The hump stores up to 80 pounds of fat, which a camel can break down into water and energy when sustenance is not available. These humps give camels their legendary ability to travel up to 100 desert miles without water. Camels rarely sweat, even in desert temperatures that reach 120°F, so when they do take in fluids they can conserve them for long periods of time.
https://www.nationalgeographic.com/animals/mammals/facts/arabian-camel
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