Abstract
Dipodomys panamintinus ( n = 7) and merriami ( n = 2), two species of kangaroo rats, were tested for drinking under total food deprivation. Both species showed polydipsia (elevated drinking) when food deprived for five days and more than tripled their average daily water intake, when food deprived, as opposed to drinking when food was ad lib. It is advanced that species which subsist on little free water respond mainly to decreased extracellular volume as a thirst cue. Since decreased vascular volume occurs during food deprivation, these species overdrink.
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