Evolution and Ecophysiology of Torpor.- Hibernation by Echidnas in Mild Climates: Hints about the Evolution of Endothermy.- Patterns of Hibernation of Echidnas in Tasmania.- Daily Heterothermy in Mammals: Coping with Unpredictable Environments.- Body Temperature and Metabolic Rate of a Hibernating Primate in Madagascar: Preliminary Results from a Field Study.- Heterothermy in Mousebirds: Evidence of Avian Proto-Torpor?.- Spontaneous Arousal in Reptiles? Body Temperature Ecology of Rosenberg’s Goanna, Varanus rosenbergi.- Hibernation in the Extreme: Burrow and Body Temperatures, Metabolism, and Limits to Torpor Bout Length in Arctic Ground Squirrels.- Energetics of Hibernation in Woodchucks (Marmota monax).- Mechanisms of Social Thermoregulation in Hibernating Alpine Marmots (Marmota marmota).- Do Patterns of Torpor Differ between Free-ranging and Captive Mammals and Birds?.- Weather Patterns and Daily Torpor in Free-ranging Animals.- Role of Soil Temperature in Timing of Emergence from Hibernation in the Jumping Mouse, Zapus hudsonius.- Temperature Selection and Energy Expenditure in the Marsupial Hibernator Cercartetus nanus.- Torpor in the Carnivorous Marsupial Sminthopsis macroura: Effects of Food Quality and Quantity.- Parasite Adaptations to Hibernation in Alpine Marmots.- Physiological Mechanisms of Torpor.- Perspectives on Metabolic Suppression during Mammalian Hibernation and Daily Torpor.- Control of Cardiac and Ventilation Frequencies during Hibernation in Ground Squirrels.- Intermittent Ventilation in Hibernating Dormice — Is Ventilation always Necessary to Meet Metabolic Demands?.- Retention of Carbon Dioxide during Entrance into Torpor in Dormice.- Thermal Cycling of the Pulmonary Surfactant System in Small Heterothermic Mammals.- Anoxia Tolerance to Oxygen Necessity: Paradigm Shift in the Physiology of Survival of Apneic Deep Hypothermia in Neonatal Rodents.- The Effects of alpha-Tocopherol on Mammalian Torpor.- Essential Fatty Acids: Their Impact on Free-living Alpine Marmots (Marmota marmota).- Circadian Rhythms of Body Temperature in Laboratory and Field Marmots (Marmota flaviventris).- Circannual Rhythms in European Ground Squirrels during Nine Years of Entrainment.- Is Hibernation Facilitated by an Inhibition of Arousal ?.- The Djungarian Hamster is Sleep Deprived during Daily Torpor.- Neuropeptides and Neurotransmitters in the Suprachiasmatic Nucleus: Relationship with the Hibernation Process.- Ultrastructure of Organs and Tissues during Hibernation.- Temperature Modulation of Glucocorticoid-receptor Affinity in a Hibernator, the European Ground Squirrel, and a Non-Hibernator, the Rat.- Follicular Development and Hibernation in European Ground Squirrels.- Effects of Hetastarch on Rewarming after Prolonged Deep Hypothermia in Rats.- Biochemical and Molecular Mechanisms of Torpor.- Gene Expression and Protein Adaptations in Mammalian Hibernation.- Quantitative and Qualitative Changes in Gene Expression during Hibernation in Golden-mantled Ground Squirrels.- Genetic Control of Carbon Utilization during Hibernation: Mechanistic Considerations.- Cellular Response to Metabolic Stress in Hibernating Mammals.- Gluconeogenesis in Brain and Liver During Daily Torpor in Deer Mice (Peromyscus maniculatus).- Cardiac Cyclic Nucleotide Phosphodiesterase (PDE) Activity in the European Hamster during Hibernation.- Temperature Dependence of Coupled and Uncoupled Oxidations in Brain Synaptosomes from Hibernators and Non-Hibernators.- Endogenous Changes in Hibernation-Specific Protein in Chipmunk Cerebrospinal Fluid.- Opioid-like Hibernation Factors Provide Protection to the Ischemic Myocardium.- Energy Balance and Cold Adaptation.- Is there a Life in the Cold without UCP1? Uncoupling Proteins and Thermoregulatory Thermogenesis.- Viral Labeling of the CNS Origins of the Sympathetic Nervous System Innervation of Brown Adipose Tissue: Implications for Torpor and Hibernation Responses.- Mitochondrial Proton Conductance, Standard Metabolic Rate and Metabolic Depression.- Mitochondria in the Cold.- A Contribution of Acid-base Regulation to Metabolic Depression in Marine Ectotherms.- Leptin — Signals and Secretions from White Adipose Tissue.- Flexibility of Basal Metabolic Rate in Arctic Breeding Kittiwakes (Rissa tridactyla).- Relationships between Resting Metabolic Rate and Morphology in Lactating Mice: What Tissues are the Major Contributors to Resting Metabolism?.- Use of the EM-SCAN® to Determine Body Composition in Previously Frozen Specimens.- The Influence of Temperature and Season on Mitogen-Induced Proliferation of Ground Squirrel Lymphocytes.- Oestradiol and Progesterone Control Cytochrome c Oxidase Activity in Thermogenic Tissues.- Low Temperature Effects and Social Influences on Physiological Condition of Subadult Wild Rabbits.- Physico-chemical Model for Brain Ganglioside Function in Thermal Adaptation of Vertebrates.- Vertebrate Freeze Tolerance: Molecular Studies of Signal Transduction and Gene Expression.- Author Index.