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Lett."],"published-print":{"date-parts":[[2024,12]]},"abstract":"<jats:p>The acute-phase response (APR) is an adaptive emergency life-history stage, wherein vertebrates exhibit fever and anorexia to survive an infection. However, induced immune responses are energetically costly, and sick animals may reduce physical activity to compensate. Tests of this predicted energetic trade-off in free-ranging animals are rare due to difficulties in measuring individual physiology and behaviour under immune challenge in natural settings. However, recent advances in biologging technology now make such studies possible. We surgically implanted heart rate\/temperature loggers in free-ranging adult male Arctic ground squirrels, fitted the squirrels with collar-mounted accelerometers and light\/temperature loggers, and injected animals with lipopolysaccharide (LPS) to simulate an immune challenge. LPS-injected squirrels exhibited approximately 1\u00b0C overnight fevers accompanied by slightly elevated (10 bpm) heart rates; LPS-injected squirrels also spent 19% less of their time aboveground the following day and reduced overall movement by 40% compared with saline-injected controls. Thus, we found support for an energetic trade-off between functional immune responses (fever and anorexia) and lethargic sickness behaviour within the APR of a free-ranging mammal. 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