Brush mouse
(Peromyscus boylii)

The Brush Mouse is a brown, medium sized mouse that occurs sporadically on the Etiwanda Fan. This species is intermediate in size and appearance to the larger California Mouse and smaller Deer Mouse. The Brush Mouse is found in chaparral and other brushy, rocky habitats throughout most of the southwestern United Stated and south into Central America, from sea level to over 6,000 feet in elevation. There are 14 races of Brush Mouse. The local race is P. b. rowleyi.

Status: Not protected
Habitat: Chaparral and other brushy, rocky habitats
Diet: Insects and seeds
Mean* adult body length: 90.7 mm
Mean* adult tail length: 106.1 mm
Mean* adult hind foot length: 21.1 mm
Mean* adult ear length: 17.8 mm

*mean measurement of individuals captured in the San Bernardino Valley by Museum researchers

The graph below shows the activity periods of adults and immatures from 1999 through 2001. The adults are active year around and the immatures are present at different periods each year. Note that immature individuals grow to adult size and molt into adult pelage within a single breeding season.

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