Western Harvest Mouse
(Reithrodontomys megalotis)

The Western Harvest Mouse is a yellow-brown, very small sized mouse that occurs sporadically on the Etiwanda Fan. This species is found in grassy areas with a variety of habitats including coastal sage scrub, alluvial fan sage scrub, and chaparral from the mid west to the Pacific Northwest south into Central America. There are 17 races of Western Harvest Mouse. The local race is R. m. longicaudus.

Status: Not protected
Habitat: Grassy habitats including meadows, marshes, pastures, and stream valleys
Diet: Grass and forb seeds, and insects
Mean* adult body length: 66.0 mm
Mean* adult tail length: 76.7 mm
Mean* adult hind foot length: 15.6 mm
Mean* adult ear length: 13.5 mm

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

The graph below shows the activity periods of adults from 1999 through 2001.

Back to Mammals of the Etiwanda Fan