They have adapted different strategies to conserve water. Many animals can survive on the water they get from eating. Lizzards, snakes and Spiders are haematocryal. Their body temperature depends on the surrounding temperature. They don’t have to keep it on a constant level like humans (or all other mamals) so they do not need to sweat. Some animals burry themself during the day and get out in the evening and morning, when it is less warm. Camels can store large amounts of water and I guess there are many other strategies.
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