Species: Reithrodontomys megalotis

May forms mixed-sex social units dominated by a male. <br><br>Home range usually is about 0.5-1.5 acres. <br><br>Density commonly may be about 5-10 per acre, up to 60/acre in optimum habitat (Gray 1943, Whitford 1976). In Canada, Nagorsen (1994 COSEWIC report) reported 1-7/ha. In Arizona, density was highly variable over 12 years, ranging from local extirpation to about 13 per ha; density averaged about 5-6 per ha in winter, about 1 per ha in late summer-early fall (Skupski 1995). In Wisconsin, autumn densities varied from about 0.75/ha in sandy fields to 45/ha in an abandoned field with a dense cover of low vegetation (Jackson 1961, Svendsen 1970). (Skupski 1995). Populations may decline during peaks in vole abundance. In Kansas, populations declined following grassland fire (Kaufman et al. 1988); moved to unburned area (Clark and Kaufman 1990). <br><br>Long-distance movements (up to 3200 m) were recorded in Kansas; vast majority moved less than 300 m (Clark et al. 1988). Movements of up to at least several hundred meters occurred in Arizona, but distance moved from one month to the next usually was less than 90 m (Skupski 1995).