Delaware’s short-tailed shrew reports turn up from the Piedmont hardwoods around Wilmington to the tidal refuges of the Coastal Plain, a spread that says more about the animal’s tolerance for different ground cover than about how common it actually is anywhere. Records cluster at White Clay Creek and Brandywine Creek State Parks in the north and at Bombay Hook, Prime Hook, Cape Henlopen, and Delaware Seashore in the south, tracking wherever there’s a thick layer of leaf litter or grass over damp soil.
A shrew that hunts with venom
This is one of the few venomous mammals in North America. Its saliva carries a toxin strong enough to subdue insects, earthworms, and even small salamanders, prey it can’t always overpower by size alone. It spends almost all its time below the leaf litter or inside shallow surface tunnels, so a clear look at one above ground is rare even where records are dense. Its metabolism runs hot enough that it needs to eat close to its own body weight in food most days just to keep going.
An October surge
Reports jump sharply in October, when the state’s monthly total runs higher than any other point in the year. That’s consistent with shrews ranging more widely and foraging harder through fallen leaves as they build fat reserves ahead of winter, when insect prey grows scarcer. That fall spike is a pattern in the records, not proof the shrews are more numerous at that time of year.
Status in Delaware
NatureServe ranks the short-tailed shrew S5, secure, and it’s native across the state. It isn’t tracked as a species of concern here, and its wide habitat tolerance, from Piedmont forest floor to coastal marsh edge, likely keeps it that way.
