The eastern fox squirrel is an introduced species with many localized populations in urban areas and nearby rural settings. Reported from San Mateo, Merced, and Ventura cos. The eastern fox squirrel is common in urban and orchard-vineyard habitats, and in eucalyptus groves. Populations dependent upon abundant mast crops. Individuals in poor habitat, or in areas of low food abundance or low population density, tend to have larger home ranges.
Males have larger home ranges than females.
Home ranges may shift to include good food sources. At high densities, may be territorial. At low densities, individuals scattered and home ranges may overlap. Females defend the nest area from other squirrels. Several squirrels may share winter dens.