California carries the largest state tally for Merriam’s shrew anywhere in its range, 30 of the species’ 31 California records, even though the animal is barely known here. That’s less a sign of unusual numbers and more a reflection of where a handful of surveys happened to look.
California’s sliver of sagebrush country
Most of California isn’t built for this shrew at all. It needs dry sagebrush flats and bunchgrass, habitat that’s genuinely common only in two corners of the state: the Modoc Plateau in the far northeast, and the high sagebrush country east of the Sierra Nevada crest around Mono and Inyo counties. Both are true Great Basin terrain, cut off from the Mediterranean climate that covers most of California, and that’s exactly the kind of ground this shrew shares with sagebrush’s other tenants, voles and pocket mice.
Borrowed tunnels, constant hunting
Unlike most shrews, Merriam’s shrew doesn’t dig its own burrow system. It moves instead through runways and old tunnels that voles and pocket mice have already built, using another animal’s engineering as its own private corridor. It hunts insects and spiders almost constantly, staying active on and off around the clock rather than keeping to a set day or night schedule, because a body this small can’t store much energy between meals.
Status in California
NatureServe hasn’t assigned Merriam’s shrew a numeric rank in California, and the species is treated as native across its mapped range here. April holds an outsized share of the state’s records, 24 of 31, which points to a single well-timed survey more than to any real spring surge in the shrew’s own activity.
Full species profile
