Part I Evolution and Ecophysiology of Torpor A Single Origin of Heterothermy in Mammals Afrotropical Heterothermy: A Continuum of Possibilities Tropical Heterothermy: Does the Exception Prove the Rule or Force a Re-Definition? Hibernation in Free-Ranging African Woodland Dormice, Graphiurus murinus Evolutionary Ecology of Mammalian Hibernation Phenology Interrelationships Among Timing of Hibernation, Reproduction, and Warming Soil in Free-Living Female Arctic Ground Squirrels Assessing the Effect of Climate Change on Hibernating Mammals Using Nonlinear Mixed Effects Method Impact of Climatic Variation on the Hibernation Physiology of Muscardinus avellanarius Comparison of Variables of Torpor Between Populations of a Hibernating Subtropical/Tropical Bat at Different Latitudes The Other Functions of Torpor Survival, Aging, and Life-History Tactics in Mammalian Hibernators Does Age Matter? Effects of Age on Hibernation Patterns in Edible Dormice (Glis glis) Sex and Seasonality: Reproduction in the Echidna (Tachyglossus aculeatus) Sex Differences in Foraging Behaviour, Body Fat and Hibernation Patterns of Free-Ranging Common Hamsters Summer Torpor and Sexual Segregation in the Subtropical Bat Rhinopoma microphyllum Heterothermy in Caprimulgid Birds: A Review of Inter-and Intraspecific Variation in Free-Ranging Populations Part II Physiology of the Torpid State The Brain at Low Temperature: Tau Hyperphosphorylation Dynamics in Hibernation Torpor The Hibernation-Related Peptide TSKY Acts as a Neuroprotector in Cultured Pond Snail Neurons The Torpor-Arousal Cycle is Controlled by an Endogenous Clock Ultradian Episodes of Thermogenesis in Mammals: Implications for the Timing of Torpor Entry and Arousal Spontaneous Daily Torpor Versus Fasting Induced Torpor in the Djungarian Hamster (Phodopus sungorus): Two Sides of a Medal or Distinct Phenomena ? Does the Road Traveled Matter ? Natural Versus Prematurely Induced Arousal from Torpor The Hibernating Immune System The Relationship Between White Nose Syndrome and Dietary PUFA Levels in Bats Impact of Hibernation on Gut Microbiota and Intestinal Barrier Function in Ground Squirrels Cardiac Electrical Alternans and Ventricular Fibrillation During Hypothermia in Non-Hibernating Versus Hibernating Animals: Role of Propagation Velocity and Dispersion of Repolarization Neonatal Deep Hypothermia: Heart Function and Metabolism Seasonal Changes in Thermoregulatory Strategies of Tegu Lizards Part III Molecular Mechanisms and Metabolic Control Phylogenetic Background of Hibernation and Hibernation-Specific Proteins in Sciuridae Adenosine, AMP, and Daily Torpor On the Dissimilarity of 50-AMP Induced Hypothermia and Torpor in Mice Potential Mechanisms of Metabolic Suppression Downstream of Central A1AR Activation During Onset of Torpor Fast In, Slow Out: Patterns and Mechanisms of Mitochondrial Suppression in Hibernation Adjustments of Mitochondrial Energy Transduction in Response to Physiological and Environmental Challenge Redox Metabolism During Tropical Diapause in a Lepidoptera Larva Biochemical Regulation of Carbohydrate Metabolism in Hibernating Bats Theme and Variation: Proteomic Changes Across Three Organs in Hibernation Cycles of the 13-Lined Ground Squirrel Putting the Brakes on Protein Synthesis in Mammalian Hibernation Part IV Energy Balance and Thermoregulation Brown Adipose Tissue: A Seasonal Tissue in Mammals, Including Humans? Systematic Screening for Mutant Mouse Lines with Defects in Body Temperature Regulation Diurnal Changes in Metabolic Rate in Pygmy Marmosets: Implications for Sleep, Torpor, and Basal Metabolism in Primates Torpor Use and Body Mass Gain During Pre-Hibernation in Late-Born Juvenile Garden Dormice Exposed to Food Shortage Seasonal Variations in Energy Turnover and Body Temperature in Free-Living Edible Dormice, Glis glis The Effect of Ambient Temperature on Body Mass, Torpor, Food Intake, and Leptin Levels: Implications on the Regulation of Food Intake in Mammalian Hibernators Ghrelin, Leptin, and Fatty Acids in Free-Living Callospermophilus lateralis (Golden-Mantled Ground Squirrels) Seasonal Variation in Brain Prostaglandin D2 and E2 of Marmots and n-6 Fatty Acid Availability Expression of Orexigenic and Anorexigenic Neuropeptides Before and During Hibernation in the Daurian Ground Squirrel (Spermophilus dauricus)