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Kangaroo rat lives in the desert, therefore, it needs to conserve water in the body. In kangaroo rat, the loop of Henle is significantly longer as it descends further into the medulla and produces a higher concentration gradient in the surrounding tissue so as to produce urine which is 18 times concentrated than that of their blood. This gradient allows more water to diffuse into the surrounding tissues to be reabsorbed. 

So the correct answer is 'Kangaroo rat'.