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An arctic ground squirrel, Spermophilus parryii, newly emerged from its hibernaculum in Alaska. During hibernation, arctic ground squirrels spontaneously and reversibly adopt core body temperatures as low as —2.9°C without freezing. See page 1593. [Photo by Steve Moffitt, Department of Biology and Wildlife, University of Alaska, Fairbanks, AK 99775]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)