Mole vs Vole vs Shrew Damage: Lawn Identification Guide

Why Identification Matters

Moles, voles, and shrews look superficially similar — small, brown, furry mammals — but they cause completely different types of damage and require entirely different control methods. Treating a vole problem with mole traps will fail (and vice versa). Moles are insectivores that damage lawns through tunneling; voles are rodents that kill plants by gnawing; shrews are insectivores that are generally beneficial. Getting the identification right saves time, money, and unnecessary pesticide use.

Mole vs Vole vs Shrew: Complete Comparison

Mole Damage: The Tunneling Insectivore

Identifying Mole Damage

Moles are the most destructive of the three species in terms of lawn appearance. Their damage is unmistakable:

• Raised ridges (surface tunnels): Moles create shallow tunnels 1-3 inches below the surface in their search for earthworms and grubs. These tunnels appear as raised, ridged lines running across the lawn. When you step on a mole ridge, it collapses and feels spongy.
• Volcano-shaped mounds (molehills): Moles excavate deeper tunnels and push the excess soil to the surface, creating conical mounds 4-12 inches across and 2-6 inches high. The soil is finely pulverized and loosely packed. Molehills are round with the exit hole in the center (under the mound).
• No visible hole entrance: Unlike vole holes, mole tunnel entrances are hidden under the mounds. You will not see an open hole at ground level.
• No plant damage: Moles do not eat plants. If your lawn has raised ridges but no gnawed plants, the culprit is definitely a mole, not a vole.
• Damage pattern: Mole ridges often follow the edges of landscaping (along fences, sidewalks, and garden borders) because these structures concentrate earthworm populations.

Mole Species

The three most common mole species in the US cause slightly different damage:

• Eastern mole (Scalopus aquaticus): The most common lawn mole east of the Rockies. Creates extensive surface ridges and moderate mounds. Active 24 hours a day in alternating 4-hour cycles.
• Star-nosed mole (Condylura cristata): Found in wet, marshy areas in the northeast. Creates mounds but fewer surface ridges. Its tunnels often open into water.
• Townsend's mole (Scapanus townsendii): The largest North American mole, found in the Pacific Northwest. Creates very large mounds (up to 2 feet across) and extensive surface ridges.

Vole Damage: The Plant-Killing Rodent

Identifying Vole Damage

Voles are the most damaging to plants of the three species. Their damage is distinct from mole damage:

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• Surface runways: Voles create 1-2 inch wide paths through the grass and thatch layer. These are open, visible trails at ground level — not raised ridges like moles. The grass in the runway may be clipped short or removed entirely, exposing bare soil.
• Open holes: Vole holes are 1-1.5 inches in diameter, round, and flush with the ground surface. There is no dirt mound. Multiple holes are connected by the surface runways.
• Gnawed bark at ground level: Voles chew the bark off trees and shrubs at or just below the soil line (girdling). This is most visible in spring after snow melts. Girdled trees may die if the damage encircles more than 50% of the trunk.
• Clipped stems: Voles clip grass, flower stems, and garden plants at a 45-degree angle, leaving the cut pieces in piles. This distinguishes vole damage from rabbit damage (clean 45-degree cuts with pieces removed).
• Root damage: Voles eat the roots of plants from below, causing plants to wilt and die for no visible above-ground reason. Pulling on the plant reveals the roots have been eaten.
• Winter damage under snow: Vole damage is often worst in early spring, revealed when snow melts. Voles travel under the snow pack, creating extensive runway systems and girdling trees and shrubs where the snow protected them from predators.

Vole Species

• Meadow vole (Microtus pennsylvanicus): The most common vole in the northern and eastern US. Creates extensive surface runways in grassy areas.
• Pine vole (Microtus pinetorum): Found in eastern woodlands and orchards. Creates mostly subsurface tunnels and causes root damage to trees — often more destructive than meadow voles because their damage is hidden underground.
• California vole (Microtus californicus): Common in western states. Causes significant damage to garden vegetables and fruit tree roots.
• Prairie vole (Microtus ochrogaster): Found in central US grasslands. Creates both surface and subsurface runways.

Shrews: The Beneficial Insectivore

Why Shrews Rarely Cause Damage

Shrews are often lumped in with moles and voles, but they are the least problematic of the three:

• Size: Shrews are the smallest of the three (2-4 inches) and lack the powerful digging forelimbs of moles or the gnawing incisors of voles.
• Diet: Shrews are voracious insectivores that eat their body weight in insects every day. They consume earthworms, beetle larvae, slugs, snails, and other invertebrates — many of which are lawn pests.
• Tunnel use: Shrews do not dig their own tunnels. They use existing mole and vole tunnels to move through the soil and hunt.
• Visible sign: Tiny holes (dime-sized) in the lawn, sometimes with small piles of insect parts nearby. No raised ridges, no surface runways, no plant damage.
• Scent: Some shrew species (short-tailed shrew) produce a musky odor from scent glands that may be noticeable near their activity areas.

If you identify shrew activity in your lawn, do not attempt to control them. Shrews are beneficial predators that reduce insect pest populations. Their presence often indicates a healthy soil ecosystem.

The Quick Identification Flowchart

1. Are there raised ridges/tunnels in the lawn? → Yes = Mole damage
2. Are there open surface paths through the grass? → Yes = Vole damage
3. Are there volcano-shaped dirt mounds? → Yes = Mole damage
4. Are there 1-1.5 inch holes with no mounds? → Yes = Vole damage
5. Is plant bark gnawed at ground level? → Yes = Vole damage
6. Are there dime-sized holes with insect parts nearby? → Yes = Shrew (beneficial)
7. No visible damage but small holes? → Likely shrew or insect holes

Control Methods by Species

Mole Control

• Traps: Harpoon (spear) traps and scissor traps placed in active surface tunnels are the most effective. Check state regulations — some states restrict trap types.
• Grub control: Reducing grub populations (a mole food source) with beneficial nematodes or milky spore may reduce mole activity, but moles primarily eat earthworms, which are beneficial and should not be eliminated.
• Repellents: Castor oil-based repellents may provide temporary relief but must be reapplied after rain.
• Barriers: Burying hardware cloth 12-24 inches deep around garden beds can exclude moles.

Vole Control

• Habitat modification: Keep grass mowed short (3 inches or less), remove ground cover near tree bases, and clear mulch 3 feet from tree trunks.
• Tree guards: Wrap tree trunks with hardware cloth or plastic tree guards from the soil line to 18 inches high to prevent girdling.
• Mouse traps: Standard mouse snap traps baited with peanut butter or apple slices placed at vole hole entrances are effective for small populations.
• Exclusion: Remove ground cover and tall grass that provides vole hiding habitat. Voles avoid crossing open areas where hawks and owls can spot them.

Shrew Control

• None needed. Shrews are beneficial insectivores that help control lawn pests. If you are seeing shrew signs, your lawn's insect population is being managed naturally.

FAQ: Mole vs Vole vs Shrew Damage

Can moles and voles be active in the same yard?

Yes, and this is common. Moles create subsurface tunnels that voles then use as ready-made highways. If you have both raised ridges (mole tunnels) and surface runways with plant damage (vole activity), you have both species. Address the vole damage first (it kills plants) and then manage the mole tunnels.

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Do moles eat plant roots?

No. Moles are insectivores that eat earthworms, grubs, and soil insects. They do not eat plant roots or bulbs. However, their tunneling can dislodge plant roots and cause indirect damage. If you find gnawed roots, the culprit is voles, not moles — voles often use mole tunnels to access plant roots underground.

Why is vole damage worse after winter?

Voles are active all winter under the snow pack. Snow provides insulation and protection from predators (hawks, owls, foxes, cats). Voles create extensive runway systems and girdle tree bark under the snow where they are safe from detection. When the snow melts in spring, the full extent of the damage is revealed. Protect young trees and shrubs with tree guards before the first snowfall to prevent winter vole damage.

How do I tell shrew holes from vole holes?

Shrew holes are dime-sized (about 1/2 inch) or smaller, while vole holes are 1-1.5 inches. Shrew holes are often in clusters with small piles of insect parts nearby, while vole holes are connected by visible surface runways through the grass. If there is no visible damage to the lawn or plants, the holes are likely from shrews or insects rather than voles.

Sources: University of Nebraska-Lincoln Extension, Penn State Extension, Oregon State University Extension, USDA Natural Resources Conservation Service. This guide is for informational purposes only and does not constitute professional pest control advice.