Body TemperatureBody Temperature RegulationTemperatureCold TemperatureHot TemperatureSkin TemperatureHypothermiaThermometersFeverHibernationTelemetryShiveringThermographyCircadian RhythmTime FactorsSciuridaeSweatingHumidityThermogenesisSeasonsHeat Stress DisordersThermometryHeatingHypothermia, InducedAntipyreticsOphthalmic SolutionsImmersionMotor ActivityPyrogensRectumThermosensingPreoptic AreaEnergy MetabolismIncubators, InfantHeart RateHeat StrokeHydrogen-Ion ConcentrationSleepHypothalamusBehavior, AnimalWaterBasal MetabolismOxygen ConsumptionAnalysis of VarianceThermoreceptorsInfrared RaysRespirationThermodynamicsAdaptation, PhysiologicalEatingN-Methyl-3,4-methylenedioxyamphetamineSymptom AssessmentHyperthermia, InducedInjections, IntraventricularTransition TemperatureCold ClimateThermal ConductivityDepressionWakefulnessClothingKineticsEar CanalBeluga WhaleClimateSeverity of Illness IndexEnvironment, ControlledCerebral VentriclesStress, PhysiologicalTreatment OutcomeRewarmingAirLizardsCarbon DioxideAdipose Tissue, BrownMytilusDimensional Measurement AccuracyAlligators and CrocodilesBody WeightComb and WattlesBrainEnvironmentProspective StudiesCalorimetry, Differential ScanningCold-Shock ResponseBody Temperature ChangesWater Loss, InsensibleRats, Sprague-DawleyLightAcclimatizationBathsDose-Response Relationship, DrugMutationSleep, REMQuestionnairesPhotoperiodAcetaminophenMolecular Sequence DataModels, BiologicalMelatoninFreezing