The northern pygmy mouse is one of the smallest rodents in North America, weighing about as much as two paperclips, and it depends on dense grass cover to move around unnoticed by predators. Its 1,231 Texas records cluster at Aransas, Padre Island, and Brazoria, three coastal refuges where mowed margins and thick prairie grass give this tiny mouse the ground-level cover its survival strategy relies on.
The monthly counts actually peak in August, not spring, with a secondary run of high months from February through April; a species this small and mostly plant-eating has no obvious reason to vanish in any season, so the swings likely track grass height, mowing schedules at the refuges, and observer effort more than the mouse’s own numbers.
NatureServe ranks it S4, Apparently Secure, in Texas, and with 1,231 records it’s among the more frequently documented small rodents along the Texas coast.
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