The correct answer is option 4, Camel. Camels are uniquely adapted to surviving in arid and desert environments where water and food are scarce. They have the ability to tolerate high salt intake without suffering from hypertension. This adaptation is due to their highly efficient kidneys, which are capable of filtering and excreting excess salt from their bodies. The kidneys of camels have a high concentration of salt transporters, which helps them retain water and eliminate excess salt through concentrated urine. This allows camels to conserve water in their bodies and survive in harsh desert conditions. In contrast, sheep, buffalo, and tigers are not adapted to high salt intake and may develop hypertension if they consume excessive amounts of salt.