ABSTRACT
Peromyscus leucopus (white-footed mouse) occupies wooded and brushy habitats from Mexico north to the Canadian border, east to Maine, and west to Colorado and Arizona. At least 15 geographic races are presently recognized. The onset of breeding is apparently regulated by temperature (especially during the late winter) and food supply. Breeding may begin as early as March and continue through October. Large-scale movements, usually of immature males, occur during the fall. P. leucopus are active all year and are primarily nocturnal. Reductions in activity levels (and hence trap success) have been correlated with low temperatures, clear nights with a full moon, and heavy precipitaion. Home ranges, which vary with habitat, population densities, age, sex, and season, average around 0.13 ha (range of 0.01 to 0.68 ha).
