The physiology of desert animals must tread a narrow path between water conservation and heat regulation. The lack of sweat glands (a water-saving measure) means that less conventional ways must be used to cool the animal in the heat of the day. Usually this is achieved by large ears or similar outgrowths which, crisscrossed by blood vessels, act as radiators to remove the animal's body heat. A structure of this kind is found on the tail of the sand flapjack. Its excess body heat is carried a Predators of the sand flapjack include desert sharks.
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