Cactus deermouse records around Bears Ears and the Book Cliffs match warm, rocky desert with shrubs, cacti, and pinyon–juniper edges. This nocturnal mouse climbs well, takes seeds, fruits, and insects, and uses its long tail for balance on rocks and vegetation. Large ears help shed heat and detect danger.
October supplies the most of 352 Utah reports, but autumn fieldwork and favorable trapping weather influence that total. The records document encounters rather than mouse abundance. Unlike a strict sand specialist, the cactus deermouse readily uses broken rock and woody cover, so its map should follow sheltered desert structure more closely than bare open flats.
Utah carries the cactus deermouse at NatureServe’s S2 (imperiled), a more cautious tier than its globally secure G5 rank, likely because the state sits at the cool, high edge of a range centered farther south in Arizona and California’s warmer deserts.
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