Food Habits
Brush mice are semiarboreal and can be found foraging in shrubs and trees for leaves and fruits. Females were captured more often than males foraging in canyon live oaks (Q. chrysolepis) (P<0.05). The individuals with the longest tails appear to spend more time climbing than those with shorter tails.
Acorns are commonly eaten by brush mice wherever they are available. Arthropods and cutworms (Protorthodes rufula) are also eaten throughout the year. A variety of fruits and seeds from Douglas-fir, ponderosa pine (Pinus ponderosa), pinyon, California buckeye, manzanita (A. patula and A. viscida), silktassel (Garrya spp.), oneseed juniper (Juniperus monosperma), hackberries (Celtis spp.), New Mexico groundsel (Senecio neomexicanus var. neomexicanus), trailing fleabane (Erigeron flagellaris), annual sunflower (Helianthus annuus), broom snakeweed, common dandelion (Taraxacum officinale), western yarrow (Achillea millefolium), white sweetclover (Melilotus albus), threenerve goldenrod (Solidago velutina), prickly-pear, desert wheatgrass (Agropyron desertorum), Kentucky bluegrass (Poa pratensis), and blue grama (Bouteloua gracilis) are eaten throughout the year when available. Other plant parts, such as leaves, stems, flowers, pollen cones and new sprouts are typically eaten in lower quantities than other foods. Fungi are typically consumed when other foods are scarce. Infrequently, stomach contents of brush mice contained pieces of mammals, birds, and fence lizards (Sceloporus spp.).
Brush mice have been observed caching pinyon pine seeds. This observation suggests that the brush mouse may play a role in seed dispersal for some plant species.
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