Shrews cause relatively minor damage compared to moles and voles, but they can still leave noticeable signs in your yard and, occasionally, inside your home. These tiny mammals (small enough to fit in a tablespoon) create dime-sized holes in lawns, gnaw on materials indoors, and produce a remarkably strong odor from scent glands. Understanding what shrew damage looks like helps you figure out whether shrews are actually your problem or whether a different small mammal is to blame.
What Shrew Damage Looks Like in Your Yard
Shrews don’t dig their own tunnel systems the way moles do. Instead, they hunt for insects above ground and borrow tunnels already made by moles or voles. The most common sign of shrew activity in a lawn is small, dime-sized holes scattered across the surface. These entry points connect to existing underground tunnel networks, and they’re noticeably smaller than the volcano-shaped mounds moles leave behind.
Because shrews are insectivores, not herbivores, they won’t chew on your plant roots, bulbs, or garden vegetables. That’s the key difference between shrew damage and vole damage. Voles are rodents with prominent orange front teeth built for gnawing, and they eat grasses, seeds, and roots. If your plants are being eaten from below, a vole is almost certainly responsible, not a shrew. Shrews stick to hunting caterpillars, grubs, beetles, grasshoppers, and other small invertebrates. You’ll typically find them under logs, leaf litter, and other damp, shaded spots where insects congregate.
Many homeowners choose to leave shrews alone once they confirm the animal isn’t a vole or mole. A shrew must consume more than its own body weight in food every day just to survive. If forced to go without food for more than a few hours, it risks starvation. That relentless appetite makes shrews surprisingly effective at controlling insect pests in gardens and lawns.
Shrew Damage Inside Your Home
Shrews are primarily outdoor animals, but they do occasionally get inside homes, and that’s when the damage becomes more of a concern. Indoors, shrews gnaw on electrical wiring and the corners of wooden surfaces to mark their territory. Chewed wiring is a genuine safety hazard and should be repaired promptly. They’ll also target areas with moisture issues, which attract the insects they feed on.
The most immediately noticeable sign of a shrew indoors isn’t visible damage at all. It’s the smell. Shrews have scent glands that produce pungent secretions nearly as strong as a skunk’s. If you notice an intense, musky odor you can’t explain, a shrew may have taken up residence. Their droppings are another giveaway: small, dark brown to black pellets with a distinctive corkscrew shape, quite different from the smooth, rod-shaped droppings mice leave behind.
How to Tell Shrews Apart From Moles and Voles
Misidentification is the most common mistake people make with small-mammal damage. Each animal leaves different evidence, and the right response depends on knowing which one you’re dealing with.
- Shrews average just under 4 inches long with short, grayish fur, a long pointed snout, and tiny eyes. They don’t create surface tunnels or raised ridges in your lawn. Their holes are dime-sized and connect to tunnels dug by other animals. Plant damage is absent.
- Moles are slightly larger (4 to 6 inches) with distinctive paddle-like front feet built for digging. They create raised surface tunnels and volcano-shaped dirt mounds. Their eyes and ears are concealed in their fur, and they have no visible external ears. If your lawn has long, raised ridges running across it, that’s a mole.
- Voles are rodents about the same size as moles, with relatively large black eyes, small ears, a blunt face, and large orange front teeth. Meadow voles eat plants and create visible surface runways through grass. If your garden plants, bulbs, or bark are being chewed, voles are the likely culprit.
The simplest rule: raised tunnels and dirt mounds point to moles, plant damage points to voles, and small entry holes with no tunneling or plant damage point to shrews.
Bite Risk From Shrews
One aspect of shrew damage that surprises most people involves their bite. The short-tailed shrew, common across the eastern United States, produces venomous saliva. It’s one of very few mammals with this ability. The venom is a neurotoxin that slows a prey animal’s heart and breathing rate, sometimes paralyzing it. The shrew doesn’t inject venom through hollow fangs like a snake. Instead, the toxin seeps into the wound as the shrew gnaws.
For humans, a short-tailed shrew bite causes burning pain and significant swelling at the bite site. It’s unpleasant but not life-threatening. The greater concern is for pets. Short-tailed shrew bites are considered dangerous for dogs and cats, particularly small ones. If your pet corners or plays with a shrew and gets bitten, watch for swelling and unusual lethargy.
Managing Shrew Problems
In the yard, the most effective approach is often to address the animals that create the tunnel systems shrews rely on. If you control a mole problem, you remove the underground highways shrews use to forage. Reducing thick ground cover, leaf litter, and brush piles near your home also makes your property less attractive by eliminating the damp, shaded habitat shrews prefer.
For indoor problems, the priority is sealing entry points. Shrews can squeeze through remarkably small gaps, so check around your foundation, utility lines, and door sweeps. Fix any moisture issues like leaky pipes or poor drainage, since damp areas attract the insects that draw shrews inside. If you find gnawed electrical wiring, have it repaired before it becomes a fire risk. Snap traps baited with peanut butter or meat and placed along walls where you’ve noticed droppings or odor can catch individual shrews that have already gotten in.
Before you go to war with shrews outdoors, though, consider the trade-off. Their appetite for grubs, caterpillars, and beetles makes them one of the more effective natural pest controls you can have in a garden. The lawn damage they cause on their own is minimal. If your yard damage is worse than a few small holes, there’s a good chance the real culprit is a mole or vole, and the shrews are just along for the ride.