Arizona’s occurrence databases hold just 38 records of the northern grasshopper mouse, spread thinly across six counties, with Cochise, Navajo, and Pima each holding 8 or 9. Those clusters sit hundreds of miles apart, which says less about where the mouse is scarce and more about where surveyors have gone looking on open ground.
Grassland gaps, not desert scrub
This is a species built for bare, open ground rather than dense cover, and Arizona’s records show that split loyalty clearly. To the north, reports trace the high grassland flats and pinyon-juniper edges of the Colorado Plateau, running from Coconino and Navajo counties out toward Mohave County’s Arizona Strip near the Grand Canyon. In the south, in Cochise and Pima counties, the mouse turns up in the semi-desert grassland valleys that separate the Sky Island ranges, not on the forested slopes themselves. Records thin out fast toward the saguaro-studded Sonoran Desert basins around Tucson and Phoenix, where dense ground cover works against an animal that hunts by sightline.
A hunter that howls
Unlike most mice, this one eats meat. Arizona’s grasshopper mice go after grasshoppers, beetles, and scorpions, occasionally even smaller rodents, and they can shrug off stings from scorpion species that would deter a lot of other predators. At night, an adult rears back and gives a thin, carrying call that researchers have likened to a miniature howl, a way of marking territory across open ground where there’s nowhere to hide a burrow’s exact location. Records peak from April through June and again in October, which likely tracks when surveyors are out looking rather than any real gap in the colder months.
Status in Arizona
NatureServe ranks the northern grasshopper mouse S5, secure, and it’s native to Arizona. It isn’t listed as nonindigenous by USGS NAS, and its wide but patchy spread across the state’s open country fits a habitat specialist that follows bare ground wherever it occurs.
Full species profile
