The northwestern marsh rice rat is a semi-aquatic rodent tied tightly to Gulf Coast salt marsh and wet prairie, and its Texas records line up with that habitat precisely: Aransas, Padre Island, and Brazoria all protect the flooded grass and bay-margin marsh this species needs, rather than being incidental refuge names.
With just 344 Texas records and a rank near the bottom third of the state’s mammals, this is one of the rarer entries among Texas’s overlay species, a genuinely sparse record set rather than a common species that’s simply under-recorded. Only 6 of those records come from iNaturalist photos; a marsh-dwelling rat that’s mostly active at night in dense wet cover is not an easy animal for a casual observer to photograph.
Sightings jump hard from March through May, when spring marsh conditions and researcher fieldwork likely overlap, and drop to near zero in several other months, a pattern that says more about when surveys ran than about the rat’s true activity.
Full species profile
