The northern rock mouse is a rock-crevice specialist restricted in Texas to the rugged canyons and boulder fields of the Trans-Pecos, so only one of its three listed reference points, Big Bend National Park, actually sits in real habitat; Balcones Canyonlands and Big Thicket are generic statewide placeholders far outside its range in the Hill Country and the East Texas pine woods.
All 189 Texas records come from GBIF rather than iNaturalist photos, consistent with a small, purely nocturnal mouse that shelters in rock piles and is rarely seen or photographed casually. The monthly pattern is sparse and uneven, a high of 56 in December against flat zeros in February, September, and October, too thin and scattered a signal to call a real seasonal cycle rather than an artifact of when a handful of surveys happened to run.
NatureServe still ranks the species S4, Apparently Secure, in Texas despite the thin record count, reflecting its known Trans-Pecos range rather than how often it’s been documented there.
Full species profile
