Abstract
This is one of two concurrent papers reviewing aspects of the thermal and water physiology and energetics of the genus Peromyscus. In this review paper, initial emphasis is given to developing a thermal life history of young mice during the preweaning and immediate post-weaning periods. Subsequent sections discuss the body temperatures, metabolic rates, body insulation, thermoregulatory mechanisms, and microclimates of adults. A comparative approach is taken throughout, and emphasis is given to acclimation and acclimatization. Major goals are to review the extant literature comprehensively and thereby help to identify directions for future research.