Body TemperatureBody Temperature RegulationBlood VesselsTemperatureCold TemperatureHot TemperatureSkin TemperatureHypothermiaThermometersFeverHibernationTelemetryShiveringThermographyLymphatic VesselsRetinal VesselsCircadian RhythmTime FactorsSciuridaeNeovascularization, PhysiologicNeovascularization, PathologicThermogenesisSweatingThermometryHumidityCoronary VesselsHeat Stress DisordersHypothermia, InducedEndothelium, VascularSeasonsHeatingAntipyreticsImmersionPyrogensEndothelial CellsMotor ActivityPreoptic AreaRectumRats, Sprague-DawleyHeart RateThermosensingMice, Inbred C57BLIncubators, InfantEnergy MetabolismHeat StrokeHypothalamusVascular Endothelial Growth Factor AImmunohistochemistryRabbitsBrainOxygen ConsumptionInfrared RaysCapillariesWaterRegional Blood FlowHydrogen-Ion ConcentrationBasal MetabolismSkinDisease Models, AnimalAdaptation, PhysiologicalThermoreceptorsArteriesHyperthermia, InducedBehavior, AnimalSleepRespirationDose-Response Relationship, DrugThermal ConductivityThermodynamicsModels, BiologicalCerebral VentriclesN-Methyl-3,4-methylenedioxyamphetamineInjections, IntraventricularTransition TemperatureRats, WistarKineticsEatingCold ClimatePericytesSwineAnalysis of VarianceClothingBeluga WhaleRewarmingMuscle, Smooth, VascularCarbon DioxideStress, PhysiologicalWakefulnessLizardsEarVasoconstrictionAntigens, CD31ClimateEar CanalBlood PressureAdipose Tissue, BrownEnvironment, ControlledMolecular Sequence DataMytilusDimensional Measurement Accuracy