Michigan holds 1,119 records of this shrew, but only 457 come from iNaturalist. The rest are GBIF specimen and survey data, a reminder that this is an animal most people never actually see, since it spends nearly all its life under leaf litter and in shallow surface tunnels rather than out in the open.
One of the few venomous mammals
The short-tailed shrew’s saliva carries a mild toxin that helps it subdue insects, earthworms, and prey as large as mice, letting it stash still-living food in an underground cache for later. That hunting style fits the leaf-litter and downed-log duff of Upper Peninsula forests like the Porcupine Mountains’ old growth and the mixed woods of Huron-Manistee, where cover for tunneling is thick and constant.
Why late-summer records spike
Records climb sharply from July through September and drop off through the rest of the year, a pattern that lines up with when small-mammal trapping surveys are most often run rather than with any real change in the shrew’s own behavior. It tunnels and hunts through the leaf litter year-round, cold months included.
Status in Michigan
NatureServe ranks the short-tailed shrew S5, secure, and Michigan lists it as native. It’s recorded across the state’s forests and wetland edges, from the Upper Peninsula’s old growth to Seney’s marsh-edge woods, even though most of that record comes from survey traps rather than sightings.
