New Mexico is one of only two states, alongside Texas, where the northern pygmy mouse turns up at all, and its records here are a small slice of a naturally narrow range. NatureServe rates it S2, Imperiled, in New Mexico, a real conservation flag rather than a data artifact. It’s one of the smallest mice in North America, active by both day and night, and it moves through grass cover on tiny surface runways instead of digging deep burrows, which makes it easy to miss.
Reports come from White Sands National Park, Organ Mountains–Desert Peaks National Monument, and Carlsbad Caverns National Park, all southern desert grassland settings that fit its range. Monthly totals are sparse and uneven, with a March spike, so no dependable seasonal pattern is visible in the numbers.
Full species profile
