Wildlife Clinic

Species

Eastern mole

Scalopus aquaticus

A velvet-furred digger with shovel hands that eats earthworms and grubs, not plant roots.

An eastern mole above ground among grass, its broad pink-clawed forefeet and pointed pink snout showing.

Photo Bert Cash from Brunswick , USA (opens in a new tab) / Wikimedia Commons, CC BY 2.0 (opens in a new tab)

At a glance

Size
Body about 13 to 17 cm; tail about 2.5 cm
Weight
About 40 to 140 g
Habitat
Lawns, fields, gardens and open woods with moist, loose soil
Diet
Earthworms, beetle grubs, insect larvae and other soil invertebrates
Active
Day and night, all year, underground
Shelter
Tunnels: shallow feeding runs and deeper permanent galleries
Lifespan
Several years
Rabies vector
No

Identification

Key marks
Short, velvety grey-brown fur; huge, broad, pink forefeet turned outwards with strong claws; pointed pink snout; no visible eyes or ears; short, nearly bare tail
Signs
Raised ridges across lawns and occasional small volcano-shaped mounds of soil
Told apart from
Voles, which have visible eyes and ears and leave open holes and surface runways
Told apart from
Star-nosed mole, which has a star of pink tentacles on its nose and a long tail
Where to look
Almost never above ground; its ridges and mounds are the usual sign

Behaviour

Eastern moles live nearly their whole lives underground. They dig shallow feeding tunnels just under the surface — the ridges seen in lawns — and deeper permanent tunnels where they rest and nest. They can dig several metres of shallow tunnel in an hour in soft soil.

Their eyes are tiny and covered by skin, and they find food by touch and smell, patrolling their tunnels for earthworms and grubs that fall in. They are solitary, and one mole's tunnels can cover a large part of a garden.

Why they matter

Moles are natural soil engineers. Their tunnels loosen and aerate soil, let water and air reach roots, and mix organic matter into the ground.

They also eat beetle grubs, including those of Japanese beetles and other lawn pests, far more effectively than most treatments do.

Reproduction and lifecycle

Mating — late winter and early spring
Gestation — about four to six weeks
Birth — March to May, one litter a year of usually two to five young
Leaving the nest — at about four weeks old
Independence — soon after; young disperse over the surface in early summer
Lifespan — up to several years

Living around people

  • Moles do not eat plant roots or bulbs; voles using mole tunnels usually do.
  • Poison baits and "mole peanuts" are grain-based and moles do not eat grain; they harm other animals instead.
  • A healthy lawn with a mole is usually a lawn with a lot of earthworms.
  • A mole found on the surface in daylight is often a youngster dispersing; it can be carried in a container to loose soil nearby.

Misconceptions

  • Moles eat garden plants. They eat worms and grubs; damage to roots and bulbs is almost always from voles.
  • Moles are blind rodents. They are not rodents at all, and their eyes, though tiny, can tell light from dark.
  • The eastern mole swims. Its scientific name, aquaticus, comes from a mistaken belief that its webbed feet meant it lived in water.

Related species

Seasonal activity

When this species is breeding, and when there are nests on the ground. Mowing during the shaded months is how most nests are found.

Breeding and active nests by month for this species
JanFebMarAprMayJunJulAugSepOctNovDec
BreedingJan: noFeb: noMar: noApr: noMay: noJun: noJul: noAug: noSep: noOct: noNov: noDec: no
Active nestsJan: noFeb: noMar: noApr: noMay: noJun: noJul: noAug: noSep: noOct: noNov: noDec: no
NotesActive in deeper tunnels in cold weatherBreeding season beginsMales search for mates; ridges appear in lawns in wet spring weatherYoung born in a grass-lined nest deep undergroundYoung leave the nest at about a month oldYoung disperse, sometimes crossing the surfaceFeeding tunnels shift deeper in dry weatherActive in deeper, cooler soilSurface ridges reappear after rainActive near the surface in moist soilFeeding tunnels move deeper as soil coolsActive in deeper tunnels

Where it lives

Recorded in 40 states and provinces. Each one links to the other animals there, and to the rehabilitators licensed for them.

Canada

If you found one

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